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A302409
Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 30, 259, 3553, 84581, 2342685, 119713006, 12137387233, 2207029867972, 643385844203031, 329004378370081339
OFFSET
1,2
COMMENTS
Diagonal of A302415.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..1..0..1..1. .0..0..0..1..0. .0..0..1..1..0
..1..1..1..1..1. .0..1..0..1..0. .1..1..1..1..0. .1..0..1..0..0
..1..0..1..0..1. .1..0..0..0..0. .0..1..0..1..0. .1..1..1..0..1
..1..0..1..0..1. .0..1..0..1..1. .0..1..0..1..0. .1..0..0..0..1
..0..0..1..0..0. .0..1..0..1..0. .1..1..0..1..0. .0..0..1..0..0
CROSSREFS
Cf. A302415.
Sequence in context: A221145 A098741 A027146 * A226968 A303679 A304218
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 07 2018
STATUS
approved