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A165400
Number of slanted 8Xn (i=1..8)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
13, 0, 11588, 110364, 4185118, 113675050, 3445935988
OFFSET
2,1
EXAMPLE
One solution for n=7
...1.1.2.2.2.2.2..............
.....1.1.1.1.2.2.2............
.......2.2.2.2.3.2.3..........
.........2.2.3.3.2.3.3........
...........2.3.3.2.3.3.4......
.............3.3.2.3.4.4.4....
...............3.3.3.3.3.4.4..
.................3.4.4.4.4.4.4
CROSSREFS
Sequence in context: A252056 A096069 A180265 * A181154 A367303 A357912
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 17 2009
STATUS
approved