A256764 Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum

352, 1936, 9152, 43264, 189696, 831744, 3502080, 14745600, 60702720, 249892864, 1015758848, 4128833536, 16663379968, 67251011584, 270331805696, 1086664474624, 4358399852544, 17480694104064, 70025528475648

Offset

1,1

Comments

Column 1 of A256771

Links

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

Formula

Empirical: a(n) = 8*a(n-1) -144*a(n-3) +272*a(n-4) +704*a(n-5) -2304*a(n-6) +5120*a(n-8) -4096*a(n-9)

Example

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

Crossrefs

Cf. A256771

Sequence in context: A235888 A256025 A256771 * A255501 A229740 A255500

Adjacent sequences: A256761 A256762 A256763 * A256765 A256766 A256767

Keyword

nonn

Author

R. H. Hardin, Apr 09 2015

Status

approved