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A206058 Number of (n+1)X4 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases 1
19832, 167960, 1278672, 11155584, 101369476, 910785080, 8150091296, 73102971728, 659630705472, 5908995673000, 53009382259744, 478167664129504, 4283688188281176, 38437914754884704, 346627362250708048 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A206063
LINKS
FORMULA
Empirical: a(n) = a(n-2) +695*a(n-3) +2*a(n-4) +1693*a(n-5) -1278*a(n-7) +682*a(n-9) +286*a(n-11) +32*a(n-13) for n>20
EXAMPLE
Some solutions for n=4
..0..3..0..0....1..2..2..3....1..2..1..1....1..2..1..3....3..0..1..1
..0..0..3..0....3..3..0..1....1..3..0..3....2..0..1..1....3..1..1..3
..1..0..0..3....3..3..1..1....1..2..2..3....2..2..3..0....1..1..2..0
..2..1..0..0....2..1..1..0....3..2..2..1....3..2..2..3....2..3..3..0
..2..2..1..0....3..1..2..1....0..1..3..3....2..3..2..2....0..3..3..1
CROSSREFS
Sequence in context: A237096 A252206 A206508 * A236497 A194197 A250703
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 03 2012
STATUS
approved

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Last modified May 24 03:29 EDT 2024. Contains 372771 sequences. (Running on oeis4.)