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A165376
Number of slanted nX7 (i=1..n)X(j=i..7+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
0
481, 25036, 534816, 7834644, 92769304, 948440084, 8713467416, 73822043172, 587308411992, 4445619331604, 32329914519032
OFFSET
2,1
EXAMPLE
One solution for n=9
...1.2.2.2.2.2.2................
.....2.2.2.2.2.2.2..............
.......2.2.2.2.2.2.3............
.........2.2.2.2.3.3.3..........
...........2.2.3.3.3.3.3........
.............3.3.3.3.3.3.4......
...............3.3.3.3.4.4.4....
.................3.3.4.4.4.4.4..
...................3.4.4.4.4.4.4
CROSSREFS
Sequence in context: A254896 A165384 A365688 * A214170 A304325 A175536
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 17 2009
STATUS
approved