A260603 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101

58, 118, 250, 532, 1136, 2480, 5418, 11776, 25694, 56138, 122376, 266782, 582226, 1270070, 2769414, 6041044, 13178442, 28742456, 62690698, 136748242, 298274638, 650578696, 1419055920, 3095272272, 6751343236, 14725993444, 32120472836

Offset

1,1

Comments

Column 2 of A260609

Links

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

Formula

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

Example

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

Crossrefs

Cf. A260609

Sequence in context: A124680 A354448 A181462 * A188238 A044245 A044626

Adjacent sequences: A260600 A260601 A260602 * A260604 A260605 A260606

Keyword

nonn

Author

R. H. Hardin, Jul 29 2015

Status

approved