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A296123
Number of n X n 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1's.
0
1, 5, 18, 74, 2098, 54286, 1810441, 227074899, 41069612676, 11999602459480, 8460640112181759, 10489963059013433653
OFFSET
1,2
COMMENTS
Diagonal of A296128.
EXAMPLE
Some solutions for n=5
..1..1..0..0..0. .0..1..0..0..0. .1..1..0..0..1. .0..1..1..0..0
..1..0..0..0..0. .1..1..0..0..0. .1..0..0..1..1. .0..0..1..0..1
..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..1..1..1..1
..0..1..1..0..0. .0..0..1..0..1. .0..0..1..0..0. .1..1..1..0..0
..0..0..1..0..0. .0..0..0..1..0. .0..1..1..0..0. .0..0..1..0..0
CROSSREFS
Cf. A296128.
Sequence in context: A183443 A034551 A052926 * A375705 A242054 A370627
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 05 2017
STATUS
approved