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A302959
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 154, 6206, 493132, 83644490, 28906043997, 20541759534725, 30306087158412513
OFFSET
1,2
COMMENTS
Diagonal of A302965.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0
..1..1..0..1..1. .0..1..1..1..0. .1..1..0..1..0. .1..1..1..1..0
..0..1..0..1..0. .0..0..0..0..1. .0..1..0..1..1. .0..0..1..0..1
..0..1..0..1..1. .1..1..1..0..0. .1..0..0..0..0. .0..0..0..1..0
..1..0..0..1..0. .0..1..1..1..0. .1..1..1..0..1. .1..1..1..1..0
CROSSREFS
Cf. A302965.
Sequence in context: A113268 A356900 A191908 * A188408 A089669 A288682
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 16 2018
STATUS
approved