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A295545
Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.
0
1, 5, 34, 598, 23315, 2094347, 434357928, 207301696580, 228110991493680, 578288109272844847, 3378456566297565709729
OFFSET
1,2
COMMENTS
Diagonal of A295551.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .1..0..1..1..0. .0..0..1..1..0. .1..0..1..1..0
..0..0..1..1..0. .1..1..0..0..0. .0..0..0..0..1. .1..0..0..0..0
..0..1..0..0..1. .1..0..0..1..0. .0..0..0..0..1. .0..0..1..0..0
..1..1..1..0..1. .0..0..0..1..1. .1..0..1..1..0. .1..0..1..0..0
..0..1..0..0..0. .1..1..0..1..0. .1..0..0..0..0. .1..0..0..1..1
CROSSREFS
Cf. A295551.
Sequence in context: A130607 A211042 A086345 * A309534 A348375 A194687
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2017
STATUS
approved