A259638 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 or 00000001

133, 365, 1483, 4146, 12348, 42524, 133078, 406770, 1313046, 4180198, 13059524, 41407226, 131557812, 414760302, 1310911640, 4153427590, 13129841142, 41501667938, 131324101864, 415367424944, 1313373627382, 4154238856134

Offset

1,1

Comments

Column 4 of A259642

Links

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

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +16*a(n-3) +7*a(n-4) -14*a(n-5) -45*a(n-6) -14*a(n-7) +5*a(n-8) +38*a(n-9) +13*a(n-10) -6*a(n-11) -6*a(n-12) for n>13

Example

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

Crossrefs

Cf. A259642

Sequence in context: A105984 A115518 A064903 * A070158 A055940 A251131

Adjacent sequences: A259635 A259636 A259637 * A259639 A259640 A259641

Keyword

nonn

Author

R. H. Hardin, Jul 02 2015

Status

approved