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A204746 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..1 introduced in row major order 0
40, 46, 22, 32, 48, 74, 116, 184, 294, 472, 760, 1226, 1980, 3200, 5174, 8368, 13536, 21898, 35428, 57320, 92742, 150056, 242792, 392842 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204754

LINKS

Table of n, a(n) for n=1..24.

W. Kuszmaul, Fast Algorithms for Finding Pattern Avoiders and Counting Pattern Occurrences in Permutations, arXiv preprint arXiv:1509.08216, 2015

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A095497 A046429 A046796 * A197734 A114839 A179435

Adjacent sequences:  A204743 A204744 A204745 * A204747 A204748 A204749

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified May 21 02:48 EDT 2019. Contains 323434 sequences. (Running on oeis4.)