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A259996 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101 1
284, 805, 2532, 6157, 13562, 39209, 112570, 265595, 662116, 1906817, 4983158, 12082675, 32339598, 88603673, 223563456, 569090083, 1539186674, 4049079097, 10269959842, 26926828037, 71786606702, 185590064541, 478561927772 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260001

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-3) +22*a(n-4) -31*a(n-6) -66*a(n-7) +42*a(n-8) +22*a(n-9) +114*a(n-10) -169*a(n-11) +417*a(n-12) -218*a(n-13) +439*a(n-14) -585*a(n-15) -36*a(n-16) -74*a(n-17) +54*a(n-18) +90*a(n-19) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A260001

Sequence in context: A285890 A061310 A333930 * A092681 A090789 A234970

Adjacent sequences:  A259993 A259994 A259995 * A259997 A259998 A259999

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 12 2015

STATUS

approved

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Last modified January 21 21:20 EST 2022. Contains 350480 sequences. (Running on oeis4.)