A261377 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

154, 266, 869, 2282, 5633, 14312, 39494, 99168, 261501, 666722, 1785513, 4510376, 12029879, 30520850, 81445076, 206279050, 550615794, 1395355514, 3723483907, 9434612056, 25180483084, 63803504988, 170274449783, 431455039974

Offset

1,1

Comments

Column 5 of A261380.

Links

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

Formula

Empirical: a(n) = 31*a(n-4) +97*a(n-6) +39*a(n-8) -144*a(n-10) -29*a(n-12) +189*a(n-14) -125*a(n-16) -14*a(n-18) +40*a(n-20) -13*a(n-22) -a(n-24) +a(n-26) for n>29

Example

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

Crossrefs

Cf. A261380.

Sequence in context: A327775 A053243 A320708 * A256024 A239564 A250626

Adjacent sequences: A261374 A261375 A261376 * A261378 A261379 A261380

Keyword

nonn

Author

R. H. Hardin, Aug 17 2015

Status

approved