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

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: A165383 A006687 A060893 * A183887 A007205 A008349

Adjacent sequences: A165372 A165373 A165374 * A165376 A165377 A165378

Keyword

nonn

Author

R. H. Hardin Sep 17 2009

Status

approved