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A261550 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011. 1
170, 269, 516, 754, 1210, 2187, 3436, 5368, 9414, 14902, 22538, 38820, 62948, 95896, 161958, 263965, 405226, 675457, 1107300, 1715143, 2825384, 4636573, 7238868, 11834981, 19424306, 30536389, 49628386, 81354986, 128648034, 208252970 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A261553.
LINKS
FORMULA
Empirical: a(n) = 9*a(n-6) +4*a(n-7) +14*a(n-9) +12*a(n-10) +2*a(n-11) +9*a(n-12) +4*a(n-13) +12*a(n-14) -16*a(n-16) +24*a(n-17) -4*a(n-18) -24*a(n-19) +22*a(n-20) -16*a(n-22) +12*a(n-23) for n>30
EXAMPLE
Some solutions for n=4
..0..0..0..0..1....1..0..0..0..0....1..1..0..0..0....1..0..0..1..0
..1..0..0..1..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..1
..0..0..0..0..1....1..0..0..1..0....1..0..0..0..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..1....0..0..0..1..0....0..1..0..0..1
..0..1..0..0..1....0..0..0..0..0....0..0..0..0..1....1..0..0..0..0
..0..1..0..1..0....1..0..0..1..1....1..0..0..0..1....0..0..0..0..0
CROSSREFS
Cf. A261553.
Sequence in context: A229467 A218071 A113789 * A043690 A043575 A043746
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 24 2015
STATUS
approved

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Last modified April 18 03:33 EDT 2024. Contains 371767 sequences. (Running on oeis4.)