A203375 Number of (n+1)X6 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

972, 15564, 253068, 4136292, 67731264, 1109832180, 18189909480, 298154846436, 4887277903812, 80111933563464, 1313194979326320, 21525927546323460, 352853780193705264, 5783993041849734792, 94811448308361126864

Offset

1,1

Comments

Column 5 of A203378

Links

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

Formula

Empirical: a(n) = 30*a(n-1) -291*a(n-2) +1278*a(n-3) -2901*a(n-4) +3519*a(n-5) -2152*a(n-6) +516*a(n-7)

Example

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

Crossrefs

Sequence in context: A171771 A206089 A217162 * A183359 A203030 A209045

Adjacent sequences: A203372 A203373 A203374 * A203376 A203377 A203378

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved