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A297425
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1's.
0
1, 2, 14, 42, 535, 11345, 431723, 28588498, 3362921639, 861591734557, 416496898515488, 327244273979649876, 483572529979247043390
OFFSET
1,2
COMMENTS
Diagonal of A297431.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..1..1..0. .0..1..1..0..0. .0..0..0..0..0
..0..1..0..0..1. .0..0..0..1..1. .0..1..1..0..0. .0..0..1..1..0
..1..0..0..1..0. .0..0..0..0..0. .0..0..0..0..0. .1..1..0..0..1
..0..1..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..1..0..1..0
..0..0..0..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..1..0..0
CROSSREFS
Cf. A297431.
Sequence in context: A109137 A192375 A267247 * A108478 A262963 A195960
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2017
STATUS
approved