A165375 - OEIS

A165375

Number of slanted nX6 (i=1..n)X(j=i..6+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner

241, 6868, 85841, 755947, 5386897, 33107075, 182659489, 930494139, 4463499425, 20442622131, 90281206769, 387257313995, 1622131788337, 6662496415651, 26917106044481, 107236122222363, 422120504603969, 1644409064133971

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,1

LINKS

R. H. Hardin, Table of n, a(n) for n=2..22

EXAMPLE

One solution for n=19

...1.2.2.2.2.2....................................

.....2.2.2.2.2.2..................................

.......2.2.2.2.2.2................................

.........2.2.2.2.2.2..............................

...........2.2.2.2.2.2............................

.............2.2.2.2.2.2..........................

...............2.2.2.2.2.2........................

.................2.2.2.2.2.2......................

...................2.2.2.2.2.3....................

.....................2.2.2.3.3.3..................

.......................2.3.3.3.3.3................

.........................3.3.3.3.4.4..............

...........................3.3.3.3.4.4............

.............................3.3.3.3.4.4..........

...............................3.3.3.3.4.4........

.................................3.3.3.3.4.4......

...................................3.3.3.3.4.4....

.....................................3.3.3.3.4.4..

.......................................3.3.3.3.4.4

CROSSREFS

Sequence in context: A006687 A372966 A060893 * A183887 A007205 A008349

Adjacent sequences: A165372 A165373 A165374 * A165376 A165377 A165378

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

STATUS

approved