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A281948
Number of n X n 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
0
1, 8, 133, 3389, 130416, 8606584, 882270370, 146454380449, 39063673211938, 16700085827135810
OFFSET
1,2
COMMENTS
Diagonal of A281955.
EXAMPLE
Some solutions for n=4
..0..0..0..1. .0..1..1..0. .0..1..1..0. .0..1..0..1. .0..1..1..1
..0..0..1..0. .0..0..0..0. .1..1..1..0. .0..1..1..0. .1..1..1..1
..1..1..1..1. .0..0..0..1. .1..1..0..1. .0..1..1..1. .0..1..1..1
..0..0..1..1. .1..0..1..0. .0..0..0..0. .1..1..1..1. .1..0..0..1
CROSSREFS
Cf. A281955.
Sequence in context: A365340 A237026 A079912 * A128287 A221545 A316177
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 03 2017
STATUS
approved