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A302664
Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 43, 934, 42367, 3640304, 637088915, 219692176894, 138670742999582
OFFSET
1,2
COMMENTS
Diagonal of A302670.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..1..1..0..0. .0..1..1..0..0. .0..0..1..1..1
..1..0..1..0..0. .1..0..1..1..0. .1..0..1..0..1. .0..1..0..0..1
..0..1..1..0..1. .1..0..0..1..1. .0..0..1..1..0. .0..1..1..0..0
..0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .1..0..1..0..1
..1..1..1..0..0. .1..1..1..0..1. .1..0..1..1..1. .0..1..0..1..1
CROSSREFS
Cf. A302670.
Sequence in context: A361878 A277496 A302218 * A201784 A364498 A340822
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2018
STATUS
approved