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A261373 Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101. 1
36, 39, 60, 97, 154, 247, 392, 618, 977, 1548, 2461, 3894, 6176, 9774, 15513, 24552, 38963, 61662, 97854, 154866, 245769, 388956, 617257, 976878, 1550272, 2453478, 3893581, 6162024, 9778911, 15476214, 24560198, 38869242, 61684093, 97621932 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A261380.

LINKS

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

FORMULA

Empirical: a(n) = a(n-2) +3*a(n-4) +2*a(n-6) for n>12

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261380.

Sequence in context: A257441 A181457 A261380 * A248372 A129288 A083248

Adjacent sequences:  A261370 A261371 A261372 * A261374 A261375 A261376

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 17 2015

STATUS

approved

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Last modified June 25 20:23 EDT 2017. Contains 288729 sequences.