A259510 Number of (n+1)X(3+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0101 0111

87, 533, 3270, 20293, 126045, 784130, 4879059, 30366347, 189000090, 1176388523, 7322185101, 45575811794, 283679519673, 1765722127481, 10990478900276, 68408656100315, 425799800891931, 2650329642920874, 16496595246904901

Offset

1,1

Comments

Column 3 of A259515

Links

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

Formula

Empirical: a(n) = 5*a(n-1) +20*a(n-2) -68*a(n-3) -97*a(n-4) +234*a(n-5) +159*a(n-6) -238*a(n-7) -94*a(n-8) +56*a(n-9) +8*a(n-10)

Example

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

Crossrefs

Cf. A259515

Sequence in context: A098139 A359341 A297509 * A109601 A297723 A061625

Adjacent sequences: A259507 A259508 A259509 * A259511 A259512 A259513

Keyword

nonn

Author

R. H. Hardin, Jun 29 2015

Status

approved