

A280597


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


0



1, 7, 45, 302, 1648, 7594, 31152, 119656, 446500, 1658080, 6210762, 23592940, 90908854, 354490210, 1394647332, 5520750316
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OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



