A255225 Number of (n+2)X(5+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

61, 67, 76, 88, 106, 133, 172, 229, 313, 436, 616, 880, 1267, 1834, 2665, 3883, 5668, 8284, 12118, 17737, 25972, 38041, 55729, 81652, 119644, 175324, 256927, 376522, 551797, 808675, 1185148, 1736896, 2545522, 3730621, 5467468, 8012941, 11743513

Offset

1,1

Comments

Column 5 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..0..1..0....1..0..0..1..0..0..1....0..1..0..0..1..0..0
..0..1..0..0..0..1..0....1..0..0..1..0..0..1....1..1..1..1..1..1..1
..1..1..1..1..1..1..1....1..0..0..1..0..0..1....0..1..0..0..1..0..0
..0..1..0..0..0..1..0....1..0..0..1..0..0..1....0..1..0..0..1..0..0
..0..1..0..0..0..1..0....1..0..0..1..0..0..1....0..1..0..0..1..0..0
..1..1..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: A014753 A349461 A316933 * A141167 A062673 A284291

Adjacent sequences: A255222 A255223 A255224 * A255226 A255227 A255228

Keyword

nonn

Author

R. H. Hardin, Feb 17 2015

Status

approved