A255224 Number of (n+2)X(4+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

43, 49, 58, 70, 88, 115, 154, 211, 295, 418, 598, 862, 1249, 1816, 2647, 3865, 5650, 8266, 12100, 17719, 25954, 38023, 55711, 81634, 119626, 175306, 256909, 376504, 551779, 808657, 1185130, 1736878, 2545504, 3730603, 5467450, 8012923, 11743495

Offset

1,1

Comments

Column 4 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..0..1..0..0..1....1..1..1..1..1..1....0..0..1..0..0..0....0..1..0..0..1..0
..0..0..1..0..0..1....1..0..0..0..0..0....0..0..1..0..0..0....0..1..0..0..1..0
..0..0..1..0..0..1....1..0..0..0..0..0....1..1..1..1..1..1....0..1..0..0..1..0
..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..0..1..0..0..1....1..0..0..0..0..0....0..0..1..0..0..0....0..1..0..0..1..0
..0..0..1..0..0..1....1..0..0..0..0..0....1..1..1..1..1..1....1..1..1..1..1..1

Crossrefs

Cf. A255228

Sequence in context: A118485 A165444 A162464 * A161406 A373679 A128653

Adjacent sequences: A255221 A255222 A255223 * A255225 A255226 A255227

Keyword

nonn

Author

R. H. Hardin, Feb 17 2015

Status

approved