A259739 Number of (n+2) X (5+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

101, 230, 792, 1882, 4904, 12086, 35036, 82492, 230779, 558772, 1577501, 3768294, 10628286, 25527500, 71944515, 172476846, 486443504, 1166766006, 3289324908, 7889105734, 22245018682, 53350796392, 150422906869, 360775136244

Offset

1,1

Comments

Column 5 of A259742.

Links

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

Formula

Empirical: a(n) = 3*a(n-2) +24*a(n-4) +17*a(n-6) -53*a(n-8) +26*a(n-10) +9*a(n-12) -13*a(n-14) +a(n-16) +a(n-18) for n>19.

Example

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

Crossrefs

Cf. A259742.

Sequence in context: A142633 A142838 A142910 * A165379 A127348 A061191

Adjacent sequences: A259736 A259737 A259738 * A259740 A259741 A259742

Keyword

nonn

Author

R. H. Hardin, Jul 04 2015

Status

approved