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A296013
Number of n X n 0..1 arrays with each 1 adjacent to 1 or 4 king-move neighboring 1's.
0
1, 7, 30, 366, 10703, 437195, 40196846, 7361110427, 2440444635515, 1635743807110941, 2128698320399136899
OFFSET
1,2
COMMENTS
Diagonal of A296019.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .1..1..0..0..0. .0..1..0..0..0. .1..1..0..0..1
..0..0..1..0..0. .0..0..0..1..1. .1..0..0..0..1. .0..0..0..0..1
..1..1..1..1..0. .0..0..0..0..0. .0..0..0..1..0. .1..1..0..0..0
..0..0..1..0..1. .0..0..1..0..1. .0..1..0..0..0. .0..0..0..0..0
..0..1..0..0..0. .0..0..1..0..1. .0..1..0..1..1. .1..1..0..1..1
CROSSREFS
Cf. A296019.
Sequence in context: A343755 A026653 A271554 * A196338 A196315 A156347
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2017
STATUS
approved