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

Author

R. H. Hardin, Jun 26 2015

Keywords

• nonn

Comments

Column 3 of A259427

Examples

			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
		

Links

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

Crossrefs

Cf. A259427

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)