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A260760 Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011 1
48, 82, 190, 350, 622, 1315, 2478, 4597, 9184, 17591, 33096, 64829, 124590, 236647, 458914, 883290, 1686838, 3255660, 6266216, 12003508, 23114992, 44476139, 85340062, 164169628, 315782978, 606459354, 1166124310, 2242522630, 4308761510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A260767

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-3) +3*a(n-4) +2*a(n-5) +5*a(n-6) +5*a(n-8) +2*a(n-9) +3*a(n-10) +4*a(n-11) +2*a(n-12) +6*a(n-13) +a(n-14) for n>15

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A260767

Sequence in context: A260767 A211722 A260834 * A260501 A260494 A039426

Adjacent sequences:  A260757 A260758 A260759 * A260761 A260762 A260763

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 30 2015

STATUS

approved

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Last modified November 18 10:08 EST 2019. Contains 329261 sequences. (Running on oeis4.)