A260833 - OEIS

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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

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