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A259634 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 or 00000001 1
18, 64, 581, 4146, 44500, 899557, 19848497, 593505391, 28804661988, 1803294030851, 150215435682396, 18581117366931470, 3161106877662837437, 725638805668965032687, 236686439674936087627391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A259642

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for n=4

..0..0..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0....0..1..0..0..0..1

..0..1..0..0..1..0....0..0..0..0..1..0....0..0..0..0..0..0....0..0..0..0..0..0

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..0

..0..1..0..0..0..0....0..0..0..1..0..0....0..0..0..0..0..0....0..0..0..0..1..0

..1..0..0..0..1..0....1..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0

CROSSREFS

Cf. A259642

Sequence in context: A238240 A232385 A275155 * A327836 A165029 A264652

Adjacent sequences:  A259631 A259632 A259633 * A259635 A259636 A259637

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 02 2015

STATUS

approved

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Last modified August 11 23:45 EDT 2020. Contains 336434 sequences. (Running on oeis4.)