A259293 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0001 0101 or 0111

170, 1134, 6870, 43870, 273686, 1729342, 10862998, 68457998, 430748742, 2712658334, 17075833814, 107515278574, 676872277478, 4261590661054, 26830077308662, 168919683740686, 1063492160890502, 6695618320318430

Offset

1,1

Comments

Column 4 of A259297

Links

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

Formula

Empirical: a(n) = 5*a(n-1) +26*a(n-2) -98*a(n-3) -188*a(n-4) +580*a(n-5) +392*a(n-6) -1024*a(n-7) -256*a(n-8) +512*a(n-9)

Example

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

Crossrefs

Cf. A259297

Sequence in context: A301867 A281397 A206122 * A262426 A250965 A250958

Adjacent sequences: A259290 A259291 A259292 * A259294 A259295 A259296

Keyword

nonn

Author

R. H. Hardin, Jun 23 2015

Status

approved