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A302272
Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 22, 89, 1219, 15862, 384916, 11370253, 325745362, 20953111994
OFFSET
1,2
COMMENTS
Diagonal of A302278.
EXAMPLE
Some solutions for n=5:
0 0 1 0 0 0 1 1 0 1 0 1 1 0 0 0 1 1 0 0
1 0 0 1 1 1 0 0 1 1 1 0 0 1 1 0 0 1 1 1
0 1 0 0 0 0 1 0 1 1 0 0 0 0 0 0 1 0 1 1
1 1 0 1 1 0 1 0 0 0 1 1 0 0 1 0 1 1 0 0
1 0 0 1 1 1 0 1 1 0 0 0 1 1 0 1 0 0 1 0
CROSSREFS
Cf. A302278.
Sequence in context: A275290 A368478 A277228 * A302723 A095663 A254332
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 04 2018
STATUS
approved