A255226 Number of (n+2)X(6+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 2 and no column sum 2

88, 94, 103, 115, 133, 160, 199, 256, 340, 463, 643, 907, 1294, 1861, 2692, 3910, 5695, 8311, 12145, 17764, 25999, 38068, 55756, 81679, 119671, 175351, 256954, 376549, 551824, 808702, 1185175, 1736923, 2545549, 3730648, 5467495, 8012968, 11743540

Offset

1,1

Comments

Column 6 of A255228

Links

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

Formula

Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -a(n-4)

Example

Some solutions for n=4
..1..1..1..1..1..1..1..1....1..1..1..1..1..1..1..1....0..0..1..0..0..0..0..1
..0..0..1..0..0..1..0..0....1..0..0..0..1..0..0..1....0..0..1..0..0..0..0..1
..0..0..1..0..0..1..0..0....1..0..0..0..1..0..0..1....1..1..1..1..1..1..1..1
..0..0..1..0..0..1..0..0....1..1..1..1..1..1..1..1....0..0..1..0..0..0..0..1
..1..1..1..1..1..1..1..1....1..0..0..0..1..0..0..1....0..0..1..0..0..0..0..1
..0..0..1..0..0..1..0..0....1..0..0..0..1..0..0..1....1..1..1..1..1..1..1..1

Crossrefs

Cf. A255228

Sequence in context: A147317 A143846 A361105 * A241491 A356368 A068356

Adjacent sequences: A255223 A255224 A255225 * A255227 A255228 A255229

Keyword

nonn

Author

R. H. Hardin, Feb 17 2015

Status

approved