A255227 Number of (n+2)X(7+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

127, 133, 142, 154, 172, 199, 238, 295, 379, 502, 682, 946, 1333, 1900, 2731, 3949, 5734, 8350, 12184, 17803, 26038, 38107, 55795, 81718, 119710, 175390, 256993, 376588, 551863, 808741, 1185214, 1736962, 2545588, 3730687, 5467534, 8013007

Offset

1,1

Comments

Column 7 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..0..0..0..1..0..0..1..0....1..0..0..1..0..0..0..0..1
..1..0..0..0..1..0..0..1..0....1..0..0..1..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..1..0..0..1..0....1..0..0..1..0..0..0..0..1
..1..0..0..0..1..0..0..1..0....1..0..0..1..0..0..0..0..1
..1..1..1..1..1..1..1..1..1....1..1..1..1..1..1..1..1..1

Crossrefs

Cf. A255228

Sequence in context: A335314 A075595 A133781 * A153815 A194634 A126096

Adjacent sequences: A255224 A255225 A255226 * A255228 A255229 A255230

Keyword

nonn

Author

R. H. Hardin, Feb 17 2015

Status

approved