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A259995 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101 1
99, 269, 805, 1819, 4383, 12412, 32525, 82616, 222474, 598599, 1577548, 4210492, 11316402, 30215951, 80758149, 216596656, 580222858, 1553421000, 4163544562, 11159591352, 29901049773, 80136519668, 214797758849, 575682349029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260001

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +10*a(n-3) +5*a(n-4) -19*a(n-5) -33*a(n-6) -45*a(n-7) -a(n-8) +25*a(n-9) +13*a(n-10) +5*a(n-11) +3*a(n-12) +9*a(n-13) +8*a(n-14)

EXAMPLE

Some solutions for n=4

..0..1..0..0....1..0..1..1....1..0..1..0....1..1..0..0....1..0..0..1

..0..0..1..0....0..0..0..0....0..1..0..0....0..1..0..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..1..0..0....0..0..0..0....0..0..0..0....1..0..0..1

..0..1..0..0....0..0..1..0....0..1..0..0....0..1..0..0....0..0..0..1

..1..0..0..0....0..0..0..0....0..1..0..0....0..1..0..0....0..0..0..0

CROSSREFS

Cf. A260001

Sequence in context: A250734 A260279 A250779 * A125820 A008902 A008882

Adjacent sequences:  A259992 A259993 A259994 * A259996 A259997 A259998

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 12 2015

STATUS

approved

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Last modified January 21 14:37 EST 2022. Contains 350479 sequences. (Running on oeis4.)