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A302509
Number of n X n 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 11, 28, 90, 458, 4558, 82857, 1748514, 44378638, 1537387012, 96444437992, 9693542232011, 1237134041433890, 196120841811367262, 47516901892945494991, 19045444458145286230306
OFFSET
1,2
COMMENTS
Diagonal of A302515.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..1
..0..0..1..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0
..0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..1..1..0
..0..1..0..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..0..0..1..0
..0..1..1..1..0. .0..1..0..1..0. .1..1..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A302515.
Sequence in context: A163696 A092781 A332669 * A335899 A018743 A077279
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2018
STATUS
approved