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A165390
Number of slanted 7Xn (i=1..7)X(j=i..n+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
11, 296, 24225, 993780, 33107075, 948440084, 25614600093, 655460808868
OFFSET
2,1
EXAMPLE
One solution for n=8
...1.1.2.2.2.2.2.2............
.....1.1.2.2.3.3.2.2..........
.......1.2.3.3.3.3.2.2........
.........3.3.3.3.3.3.3.4......
...........3.3.3.3.3.4.4.4....
.............3.3.3.4.4.4.4.4..
...............3.4.4.4.4.4.4.4
CROSSREFS
Sequence in context: A133515 A258191 A350938 * A213256 A067424 A001538
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 17 2009
STATUS
approved