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A260242
Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001
1
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
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
Sequence in context: A044431 A044812 A221373 * A250734 A260279 A250779
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 20 2015
STATUS
approved