

A281073


Number of n X n 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.


0



0, 0, 55, 958, 10954, 89042, 566178, 3035844, 14551996, 65113158, 280515214, 1187820788, 5004343732
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OFFSET

1,3


COMMENTS



LINKS



EXAMPLE

Some solutions for n=4
..0..0..0..1. .0..1..0..0. .0..1..1..0. .0..1..0..1. .0..1..1..0
..1..1..0..1. .1..1..1..1. .0..0..1..1. .1..0..1..0. .1..0..0..1
..0..1..0..0. .0..0..0..1. .1..1..0..0. .1..0..1..1. .0..1..0..1
..0..1..0..1. .1..1..0..1. .0..0..1..1. .1..1..0..1. .0..1..0..0


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



