A260242 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001

99, 213, 551, 1235, 3026, 7822, 18837, 45114, 113177, 278981, 673881, 1658848, 4103482, 10010581, 24491986, 60359993, 148047597, 362209985, 889739556, 2185247654, 5354240443, 13133074594, 32246360727, 79089150691, 193945475731

Offset

1,1

Comments

Column 2 of A260248

Links

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

Formula

Empirical: a(n) = a(n-1) +a(n-2) +4*a(n-3) +9*a(n-4) -13*a(n-5) +14*a(n-6) +6*a(n-7) -35*a(n-8) +11*a(n-9) +11*a(n-10) -4*a(n-11) -14*a(n-12) +10*a(n-13) -4*a(n-14) for n>15

Example

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

Crossrefs

Cf. A260248

Sequence in context: A044431 A044812 A221373 * A250734 A260279 A250779

Adjacent sequences: A260239 A260240 A260241 * A260243 A260244 A260245

Keyword

nonn

Author

R. H. Hardin, Jul 20 2015

Status

approved