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A260833 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101 2
48, 131, 700, 2235, 3828, 19718, 80516, 181176, 766388, 3885356, 12122540, 43330160, 229463444, 972300920, 3559612500, 17890822312, 91527500980 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A260841

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A260841

Sequence in context: A211500 A295428 A118145 * A260972 A244380 A260493

Adjacent sequences:  A260830 A260831 A260832 * A260834 A260835 A260836

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 01 2015

STATUS

approved

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Last modified December 6 06:14 EST 2021. Contains 349563 sequences. (Running on oeis4.)