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A204373 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order 0
33, 48, 61, 87, 136, 217, 347, 560, 901, 1455, 2352, 3801, 6147, 9944, 16085, 26023, 42104, 68121, 110219, 178336, 288549, 466879, 755424, 1222297, 1977715 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204381

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Some solutions for n=3

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

..1..1..1..1..1....1..1..1..1..1....1..1..1..1..1....1..1..1..1..1

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

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

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

CROSSREFS

Sequence in context: A179244 A258698 A258697 * A111502 A080933 A328247

Adjacent sequences:  A204370 A204371 A204372 * A204374 A204375 A204376

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified September 16 21:28 EDT 2021. Contains 347473 sequences. (Running on oeis4.)