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A281830
Number of n X n 0..1 arrays with no element equal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
0
1, 8, 163, 8240, 1053407, 324602161, 249711414322, 479393254207028, 2274674243457364486
OFFSET
1,2
COMMENTS
Diagonal of A281837.
EXAMPLE
Some solutions for n=4
..0..0..0..0. .0..1..0..0. .0..1..1..0. .0..1..1..0. .0..0..0..1
..1..0..1..0. .1..1..0..1. .0..1..0..1. .0..0..1..0. .0..1..1..1
..0..1..1..1. .1..0..1..0. .1..0..0..1. .1..0..0..0. .1..0..1..0
..0..1..0..0. .0..0..1..1. .1..1..0..1. .1..1..1..1. .1..0..0..1
CROSSREFS
Cf. A281837.
Sequence in context: A143857 A025606 A224899 * A299075 A299840 A353777
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 31 2017
STATUS
approved