A255223 Number of (n+2)X(3+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

31, 37, 46, 58, 76, 103, 142, 199, 283, 406, 586, 850, 1237, 1804, 2635, 3853, 5638, 8254, 12088, 17707, 25942, 38011, 55699, 81622, 119614, 175294, 256897, 376492, 551767, 808645, 1185118, 1736866, 2545492, 3730591, 5467438, 8012911, 11743483

Offset

1,1

Comments

Column 3 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
..0..1..0..0..1....0..1..0..0..0....1..1..1..1..1....0..1..0..0..1
..1..1..1..1..1....1..1..1..1..1....0..1..0..0..0....0..1..0..0..1
..0..1..0..0..1....0..1..0..0..0....0..1..0..0..0....0..1..0..0..1
..0..1..0..0..1....0..1..0..0..0....1..1..1..1..1....0..1..0..0..1
..1..1..1..1..1....1..1..1..1..1....0..1..0..0..0....0..1..0..0..1
..0..1..0..0..1....0..1..0..0..0....0..1..0..0..0....1..1..1..1..1

Crossrefs

Cf. A255228

Sequence in context: A180540 A279846 A291994 * A230225 A129998 A180542

Adjacent sequences: A255220 A255221 A255222 * A255224 A255225 A255226

Keyword

nonn

Author

R. H. Hardin, Feb 17 2015

Status

approved