A255142 Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 and no antidiagonal sum 0 and no row sum 1 and no column sum 1

47, 115, 302, 784, 2086, 5661, 15406, 41999, 114801, 314146, 859864, 2354180, 6446675, 17654832, 48350751, 132419875, 362668438, 993273148, 2720374234, 7450570937, 20405675838, 55887227675, 153064418321, 419214227578

Offset

1,1

Comments

Column 1 of A255149

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +8*a(n-3) -2*a(n-4) -6*a(n-5) -16*a(n-6) -13*a(n-7) +6*a(n-8) +14*a(n-9) +12*a(n-10) -4*a(n-12) -4*a(n-13)

Example

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

Crossrefs

Cf. A255149

Sequence in context: A142057 A246932 A255149 * A114646 A239686 A118091

Adjacent sequences: A255139 A255140 A255141 * A255143 A255144 A255145

Keyword

nonn

Author

R. H. Hardin, Feb 15 2015

Status

approved