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A261706 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111. 1
172, 270, 468, 662, 1168, 2372, 3700, 6158, 11812, 19350, 31112, 58428, 98160, 157340, 290888, 493946, 796540, 1451708, 2482588, 4029944, 7257136, 12470954, 20367532, 36325296, 62623576, 102859784, 181987616, 314402990, 519129804 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A261709.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-3) +3*a(n-6) +4*a(n-7) -2*a(n-9) +4*a(n-11) -8*a(n-13) +10*a(n-14) for n>20

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A261709.

Sequence in context: A067356 A230371 A056132 * A043387 A246475 A202641

Adjacent sequences:  A261703 A261704 A261705 * A261707 A261708 A261709

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 28 2015

STATUS

approved

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Last modified July 15 22:48 EDT 2019. Contains 325061 sequences. (Running on oeis4.)