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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 17 22:14 EDT 2021. Contains 347489 sequences. (Running on oeis4.)