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A302802
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 169, 8718, 1089773, 327603711, 238687785290, 420681832487223, 1791195821074091291
OFFSET
1,2
COMMENTS
Diagonal of A302808.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..1
..0..1..1..1..1. .0..1..1..0..0. .1..1..1..1..0. .0..0..1..1..1
..1..1..1..0..0. .1..0..0..1..0. .0..0..0..0..1. .1..0..1..0..1
..0..1..0..1..1. .0..0..1..1..0. .0..1..1..0..0. .0..1..1..0..1
..0..1..1..0..0. .0..0..1..1..1. .1..1..1..1..0. .0..0..0..1..1
CROSSREFS
Cf. A302808.
Sequence in context: A139564 A264113 A181198 * A316816 A001534 A096486
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 13 2018
STATUS
approved