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A297648
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1's.
0
1, 10, 231, 11024, 2525244, 1906300826, 3863740405975, 26223048303944542, 618905182069042142432, 45235515405863464673598537
OFFSET
1,2
COMMENTS
Diagonal of A297654.
EXAMPLE
Some solutions for n=4
..1..1..1..0. .0..1..0..1. .1..0..1..0. .0..1..1..0. .1..1..1..1
..1..0..0..0. .1..0..1..1. .0..1..0..1. .1..0..0..0. .1..0..0..0
..0..0..1..0. .0..0..1..0. .1..1..0..0. .0..0..1..0. .0..1..1..0
..0..0..0..1. .1..1..0..1. .0..1..0..0. .0..0..1..1. .1..1..0..1
CROSSREFS
Cf. A297654.
Sequence in context: A239772 A239773 A087434 * A012240 A295410 A188679
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2018
STATUS
approved