A260975 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101

204, 239, 372, 732, 1288, 2576, 4688, 8760, 15964, 30062, 55496, 105078, 192148, 361876, 663360, 1248880, 2301984, 4312846, 7974836, 14889918, 27581092, 51446550, 95444100, 177936588, 330029564, 614889132, 1141497232, 2126263226

Offset

1,1

Comments

Column 3 of A260980

Links

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

Formula

Empirical: a(n) = 8*a(n-4) +6*a(n-5) +10*a(n-7) +5*a(n-8) -24*a(n-9) -4*a(n-10) -26*a(n-11) +39*a(n-12) -a(n-14) for n>18

Example

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

Crossrefs

Cf. A260980

Sequence in context: A198913 A224983 A138605 * A271643 A108877 A163393

Adjacent sequences: A260972 A260973 A260974 * A260976 A260977 A260978

Keyword

nonn

Author

R. H. Hardin, Aug 06 2015

Status

approved