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A320396
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 142, 5956, 561290, 127789964, 69104597430, 87904609418608, 265822679694670068, 1902510531491092792194
OFFSET
1,2
COMMENTS
Diagonal of A320402.
EXAMPLE
Some solutions for n=5:
0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 1 1 1 1 1 1 1 0 0 1 1 0 1 1 1 1 0
1 0 0 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1
1 0 1 1 0 1 0 1 0 0 1 1 1 0 0 0 0 0 0 1
1 0 1 1 1 0 1 1 1 1 0 0 1 0 0 0 0 1 1 0
CROSSREFS
Cf. A320402.
Sequence in context: A180357 A373874 A317112 * A112464 A227875 A235383
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Oct 12 2018
STATUS
approved