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A261375 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101. 1
60, 82, 202, 424, 869, 1714, 3778, 7462, 15888, 31618, 68245, 135058, 290195, 575938, 1238957, 2455954, 5282429, 10475722, 22530337, 44674906, 96090169, 190539730, 409810129, 812624530, 1747814377, 3465775738, 7454228289, 14781184618 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A261380.

LINKS

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

FORMULA

Empirical: a(n) = a(n-2) +11*a(n-4) +13*a(n-6) -2*a(n-8) -2*a(n-10) +4*a(n-12) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261380.

Sequence in context: A290018 A323979 A067207 * A217740 A123712 A178212

Adjacent sequences:  A261372 A261373 A261374 * A261376 A261377 A261378

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 17 2015

STATUS

approved

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Last modified May 14 22:40 EDT 2021. Contains 343909 sequences. (Running on oeis4.)