A259422 Number of (n+1)X(3+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111

142, 1366, 12953, 123306, 1172659, 11155819, 106118138, 1009466878, 9602626846, 91346008647, 868937609248, 8265855103277, 78629755083895, 747973270226802, 7115169104694298, 67683744437222992, 643848260656503313

Offset

1,1

Comments

Column 3 of A259427

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +41*a(n-2) -44*a(n-3) -278*a(n-4) +51*a(n-5) +426*a(n-6) +36*a(n-7) -131*a(n-8)

Example

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

Crossrefs

Cf. A259427

Sequence in context: A217531 A158135 A092230 * A219146 A200453 A283638

Adjacent sequences: A259419 A259420 A259421 * A259423 A259424 A259425

Keyword

nonn

Author

R. H. Hardin, Jun 26 2015

Status

approved