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A261109 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101 1
97, 206, 566, 1498, 3908, 10268, 27030, 70980, 186290, 489516, 1286458, 3379154, 8876106, 23319066, 61261972, 160934256, 422777430, 1110660098, 2917747758, 7665011686, 20136272074, 52898777022, 138967021622, 365071414304 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A261113

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A261113

Sequence in context: A176011 A157410 A142504 * A142689 A142908 A006310

Adjacent sequences:  A261106 A261107 A261108 * A261110 A261111 A261112

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 08 2015

STATUS

approved

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Last modified June 18 15:25 EDT 2019. Contains 324213 sequences. (Running on oeis4.)