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A261262 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101. 1
321, 418, 1483, 4350, 11733, 28540, 85617, 217484, 628033, 1580858, 4617302, 11652770, 33898865, 85532220, 249024281, 628631908, 1828906789, 4618358508, 13433388869, 33933688612, 98664937854, 249321005374, 724680771669 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A261265.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-2) +26*a(n-4) +a(n-5) +42*a(n-6) -2*a(n-7) +7*a(n-8) -8*a(n-9) -52*a(n-10) +13*a(n-11) -40*a(n-12) -25*a(n-13) +33*a(n-14) -14*a(n-15) +11*a(n-16) +17*a(n-17) +14*a(n-18) -7*a(n-19) -14*a(n-20) +12*a(n-21) -10*a(n-23) +4*a(n-25) for n>28

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261265.

Sequence in context: A264063 A174778 A300849 * A308527 A268517 A228226

Adjacent sequences:  A261259 A261260 A261261 * A261263 A261264 A261265

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 13 2015

STATUS

approved

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Last modified August 11 01:53 EDT 2020. Contains 336418 sequences. (Running on oeis4.)