A259246 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0011 or 0111

111, 581, 2816, 14425, 71313, 361728, 1803859, 9106657, 45601304, 229700941, 1152550829, 5799573000, 29129216479, 146507741197, 736226561792, 3702139968817, 18608625262249, 93565783612448, 470365315223067

Offset

1,1

Comments

Column 4 of A259250

Links

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

Formula

Empirical: a(n) = 7*a(n-1) +12*a(n-2) -141*a(n-3) +15*a(n-4) +798*a(n-5) -177*a(n-6) -1505*a(n-7) -48*a(n-8) +375*a(n-9) -a(n-10) -6*a(n-11)

Example

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

Crossrefs

Cf. A259250

Sequence in context: A304831 A364023 A304516 * A205830 A302228 A302671

Adjacent sequences: A259243 A259244 A259245 * A259247 A259248 A259249

Keyword

nonn

Author

R. H. Hardin, Jun 22 2015

Status

approved