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A261376 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101. 1
97, 157, 424, 1040, 2282, 5254, 12500, 28885, 66332, 154413, 358786, 830309, 1923846, 4465820, 10349526, 23993883, 55620850, 129004265, 298983410, 693371845, 1607151330, 3727183505, 8638778942, 20034575762, 46436324264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A261380.

LINKS

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

FORMULA

Empirical: a(n) = a(n-2) +18*a(n-4) +32*a(n-6) -7*a(n-8) -33*a(n-10) +13*a(n-12) +25*a(n-14) -28*a(n-16) +9*a(n-18) -a(n-20) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A261380.

Sequence in context: A000923 A142528 A139500 * A142094 A142212 A108655

Adjacent sequences:  A261373 A261374 A261375 * A261377 A261378 A261379

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 17 2015

STATUS

approved

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Last modified May 15 18:26 EDT 2021. Contains 343920 sequences. (Running on oeis4.)