A260279 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011

99, 230, 747, 2027, 5420, 15306, 42175, 114513, 316679, 874845, 2397776, 6596755, 18184634, 50001731, 137513534, 378580791, 1041706050, 2865675286, 7885936120, 21700245925, 59706090387, 164287119004, 452064660346, 1243881032722

Offset

1,1

Comments

Column 3 of A260284

Links

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

Formula

Empirical: a(n) = 14*a(n-3) +17*a(n-4) +20*a(n-5) -19*a(n-6) -46*a(n-7) -49*a(n-8) +2*a(n-9) +27*a(n-10) +34*a(n-11) +9*a(n-12) -4*a(n-13) -4*a(n-14) for n>19

Example

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

Crossrefs

Cf. A260284

Sequence in context: A221373 A260242 A250734 * A250779 A259995 A125820

Adjacent sequences: A260276 A260277 A260278 * A260280 A260281 A260282

Keyword

nonn

Author

R. H. Hardin, Jul 22 2015

Status

approved