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A260761 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011 1
82, 115, 265, 481, 798, 1671, 3196, 5596, 11008, 21414, 38685, 73802, 143343, 265124, 499236, 961606, 1804214, 3387690, 6472826, 12229083, 22991554, 43688857, 82748766, 155915780, 295370360, 559665162, 1056451639, 1998590816, 3785473856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260767

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-3) +6*a(n-4) +2*a(n-5) -6*a(n-6) -18*a(n-7) -18*a(n-8) -8*a(n-9) +2*a(n-10) +21*a(n-11) +23*a(n-12) +10*a(n-13) +11*a(n-14) -5*a(n-15) -8*a(n-16) -a(n-17) -4*a(n-18) +a(n-20) for n>23

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260767

Sequence in context: A025361 A296809 A223085 * A037159 A223088 A039547

Adjacent sequences:  A260758 A260759 A260760 * A260762 A260763 A260764

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 30 2015

STATUS

approved

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Last modified October 14 16:29 EDT 2019. Contains 328022 sequences. (Running on oeis4.)