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A165399
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, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value
0
11, 0, 7748, 70658, 1700146, 30346872, 564638514
OFFSET
2,1
EXAMPLE
One solution for n=8
...1.1.2.2.2.2.2.2............
.....1.1.2.2.2.3.2.2..........
.......1.2.3.2.3.2.2.2........
.........3.3.2.3.2.3.3.4......
...........3.3.3.2.3.4.4.4....
.............3.3.2.3.3.3.4.4..
...............3.3.3.3.3.3.4.4
CROSSREFS
Sequence in context: A277560 A073865 A036931 * A157712 A266379 A158215
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 17 2009
STATUS
approved