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A206005 Number of (n+1)X4 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero 1
228, 980, 2728, 12068, 33572, 150396, 419108, 1895206, 5286788, 24077032, 67200552, 307662788, 858930264, 3947689488, 11022344624, 50802408116, 141850386688, 655129480632, 1829250701552, 8460734276112, 23623691166880 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A206010
LINKS
FORMULA
Empirical: a(n) = 32*a(n-2) -356*a(n-4) +1590*a(n-6) -2264*a(n-8) -8*a(n-10) +1168*a(n-12) -336*a(n-14) for n>18
EXAMPLE
Some solutions for n=4
..1..1..1..1....2..2..2..1....2..1..0..2....1..1..1..0....1..2..0..2
..0..1..2..1....1..2..1..1....1..1..2..2....1..2..1..2....2..2..2..2
..1..1..1..1....1..1..1..0....1..2..2..0....2..2..2..2....2..1..2..0
..0..1..2..1....0..1..2..2....1..1..2..2....1..2..0..2....2..2..2..2
..1..1..1..1....1..1..1..2....0..1..1..2....2..2..2..2....1..2..1..2
CROSSREFS
Sequence in context: A043411 A172531 A258557 * A228963 A252220 A263301
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 02 2012
STATUS
approved

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Last modified April 13 20:16 EDT 2024. Contains 371645 sequences. (Running on oeis4.)