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A281463
Number of n X n 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.
0
1, 8, 24, 96, 278, 706, 1887, 4795, 11794, 28951, 70400, 167177, 395417, 926397, 2160731, 4999028
OFFSET
1,2
COMMENTS
Diagonal of A281469.
EXAMPLE
Some solutions for n=4
..0..0..1..1. .0..1..1..0. .0..1..1..0. .0..0..1..0. .0..0..1..1
..1..0..1..0. .0..1..0..0. .0..0..1..0. .1..0..1..0. .1..0..1..0
..1..0..1..1. .0..1..0..1. .1..0..1..0. .1..0..1..0. .1..0..1..0
..1..0..0..1. .1..1..0..1. .1..0..1..1. .0..0..1..0. .0..0..1..1
CROSSREFS
Cf. A281469.
Sequence in context: A019260 A019221 A334756 * A267326 A063515 A220706
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2017
STATUS
approved