A261378 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

247, 470, 1714, 5254, 14312, 42302, 128998, 377183, 1099308, 3261560, 9647696, 28358158, 83587624, 246835566, 727709732, 2144744412, 6325797274, 18656814748, 55007382412, 162201500248, 478326263928, 1410502041960, 4159149074114

Offset

1,1

Comments

Column 6 of A261380.

Links

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

Formula

Empirical: a(n) = a(n-2) +54*a(n-4) +147*a(n-6) -232*a(n-8) -760*a(n-10) +1201*a(n-12) +1735*a(n-14) -4951*a(n-16) +1746*a(n-18) +4365*a(n-20) -3877*a(n-22) -2176*a(n-24) +4748*a(n-26) -2239*a(n-28) +25*a(n-30) +151*a(n-32) +117*a(n-34) -35*a(n-36) -2*a(n-38) -a(n-40) for n>44

Example

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

Crossrefs

Cf. A261380.

Sequence in context: A283737 A020313 A318055 * A063356 A250608 A127349

Adjacent sequences: A261375 A261376 A261377 * A261379 A261380 A261381

Keyword

nonn

Author

R. H. Hardin, Aug 17 2015

Status

approved