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A295524
Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1's.
0
1, 10, 147, 7071, 1012315, 437241277, 563330031268, 2154370064869978, 24591601562099287015, 837044464889796587986014, 84914857903369744218835564258
OFFSET
1,2
COMMENTS
Diagonal of A295531.
EXAMPLE
Some solutions for n=5
..1..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..0..0..0
..1..1..1..1..0. .0..0..1..0..0. .0..0..1..0..1. .0..0..0..0..0
..0..0..1..0..1. .1..0..1..0..1. .1..0..0..1..1. .0..1..1..0..1
..1..0..0..0..1. .1..0..0..1..1. .1..0..1..0..0. .1..1..0..1..1
..1..0..1..1..1. .0..0..0..1..0. .0..0..1..0..0. .0..0..0..1..0
CROSSREFS
Cf. A295531.
Sequence in context: A134526 A297714 A055761 * A095889 A097638 A178084
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2017
STATUS
approved