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A251986 Number of (n+2)X(2+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 1 or 5 1
20011, 231559, 3069283, 43957515, 663814741, 10354206421, 164646337261, 2648489572393, 42891326673193, 697320655791303, 11362478125413003, 185385704533268171, 3026933091644568399, 49444184724604712255 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A251989

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=1

..0..2..0..2....0..1..2..0....1..1..1..0....2..2..0..0....0..1..1..0

..0..2..0..0....1..0..1..2....0..1..1..1....0..0..0..2....2..0..1..2

..0..2..0..0....2..1..0..2....1..2..0..1....2..0..2..2....1..1..2..0

CROSSREFS

Sequence in context: A090072 A236115 A035926 * A251880 A186565 A186480

Adjacent sequences:  A251983 A251984 A251985 * A251987 A251988 A251989

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 12 2014

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)