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A296571
Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 0, 1 or 3 neighboring 1's.
0
2, 11, 135, 4543, 368720, 76657600, 40337678992, 53581963873035, 180182113404833816, 1531920692297677424230, 32940396032569628105781490, 1791350856665706531145980060981
OFFSET
1,1
COMMENTS
Diagonal of A296578.
EXAMPLE
Some solutions for n=5
..1..0..0..0..0. .1..0..0..0..0. .0..0..0..0..0. .1..0..1..0..0
..1..0..1..0..0. .1..0..0..0..0. .0..1..0..0..1. .0..0..1..1..0
..0..0..0..1..0. .0..1..1..0..1. .0..1..0..0..0. .1..0..1..1..1
..1..0..0..0..1. .0..0..0..0..0. .0..0..0..1..0. .1..0..0..0..0
..1..0..1..0..1. .0..0..0..0..1. .0..1..0..0..0. .0..1..0..1..0
CROSSREFS
Cf. A296578.
Sequence in context: A139387 A041725 A330638 * A077544 A087480 A060059
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2017
STATUS
approved