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

20011, 231559, 3069283, 43957515, 663814741, 10354206421, 164646337261, 2648489572393, 42891326673193, 697320655791303, 11362478125413003, 185385704533268171, 3026933091644568399, 49444184724604712255

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: A035926 A090072 A236115 * A251880 A186565 A186480

Adjacent sequences: A251983 A251984 A251985 * A251987 A251988 A251989

Keyword

nonn

Author

R. H. Hardin, Dec 12 2014

Status

approved