A256742 Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0

393, 570, 1564, 2512, 6352, 12280, 28816, 60728, 137768, 311200, 695592, 1606920, 3675600, 8477144, 19719880, 45890144, 107177032, 251576104, 590847248, 1391314808, 3284435240, 7758601632, 18359082728, 43496258888, 103115774544

Offset

1,1

Comments

Column 2 of A256748

Links

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

Formula

Empirical: a(n) = a(n-1) +6*a(n-2) +5*a(n-3) -19*a(n-4) -34*a(n-5) +8*a(n-6) +52*a(n-7) +24*a(n-8) for n>13

Example

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

Crossrefs

Cf. A256748

Sequence in context: A048129 A045194 A105210 * A158002 A083752 A047825

Adjacent sequences: A256739 A256740 A256741 * A256743 A256744 A256745

Keyword

nonn

Author

R. H. Hardin, Apr 09 2015

Status

approved