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A259422 Number of (n+1)X(3+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111 1
142, 1366, 12953, 123306, 1172659, 11155819, 106118138, 1009466878, 9602626846, 91346008647, 868937609248, 8265855103277, 78629755083895, 747973270226802, 7115169104694298, 67683744437222992, 643848260656503313 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A259427
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +41*a(n-2) -44*a(n-3) -278*a(n-4) +51*a(n-5) +426*a(n-6) +36*a(n-7) -131*a(n-8)
EXAMPLE
Some solutions for n=4
..0..1..0..0....1..0..0..0....0..0..1..0....1..0..1..1....1..1..0..0
..1..1..0..0....1..0..1..1....1..0..0..0....0..0..0..1....0..1..0..1
..0..0..0..1....1..0..0..0....0..0..1..0....0..0..0..0....0..1..0..0
..1..0..1..1....1..1..1..1....1..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..1..0....1..0..0..0....0..1..1..1....0..0..0..0
CROSSREFS
Sequence in context: A217531 A158135 A092230 * A219146 A200453 A283638
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 26 2015
STATUS
approved

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Last modified May 30 03:06 EDT 2024. Contains 372957 sequences. (Running on oeis4.)