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A206204 Number of (n+1)X7 0..3 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases 1
117084, 67968, 60800, 109720, 236488, 484704, 1080648, 2383520, 5023520, 11272288, 24906080, 51970688, 113273344, 249152672, 519714752, 1132733728, 2491526720, 5197147520, 11327337280, 24915267200, 51971475200, 113273372800 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A206206
LINKS
FORMULA
Empirical: a(n) = 10*a(n-3) for n>16
EXAMPLE
Some solutions for n=4
..0..3..1..1..2..2..2....1..0..0..0..0..3..1....3..0..0..3..1..1..1
..0..0..1..1..1..2..2....2..3..3..0..0..0..1....0..0..0..1..1..1..3
..0..0..0..1..1..1..2....2..3..3..3..0..0..0....0..0..1..1..1..2..2
..1..0..0..0..1..1..1....2..2..3..3..3..0..0....0..1..1..1..2..2..2
..2..2..0..0..0..1..1....2..2..2..3..3..3..0....0..1..1..2..2..2..1
CROSSREFS
Sequence in context: A233681 A246557 A289911 * A251953 A204075 A235068
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 04 2012
STATUS
approved

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Last modified April 21 23:01 EDT 2024. Contains 371886 sequences. (Running on oeis4.)