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A261261 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101. 1
166, 232, 690, 1918, 4350, 10382, 26072, 63964, 155288, 379950, 931560, 2278454, 5570500, 13629422, 33349058, 81580648, 199570734, 488243484, 1194455224, 2922102016, 7148645416, 17488560724, 42784191822, 104667572730, 256059752954 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A261265.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +5*a(n-3) +4*a(n-4) +8*a(n-5) +7*a(n-6) +7*a(n-7) +5*a(n-8) -5*a(n-9) -8*a(n-10) -7*a(n-11) -5*a(n-12) -a(n-13) +a(n-14) +a(n-15) +a(n-16) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261265.

Sequence in context: A184128 A015982 A065210 * A261288 A038007 A020361

Adjacent sequences:  A261258 A261259 A261260 * A261262 A261263 A261264

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 13 2015

STATUS

approved

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Last modified October 19 20:37 EDT 2021. Contains 348091 sequences. (Running on oeis4.)