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A206201 Number of (n+1)X4 0..3 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases 1
1768, 3008, 5136, 11832, 27400, 60800, 145208, 346080, 775944, 1799656, 4265112, 9666256, 22287416, 52569856, 120132224, 276283624, 648644008, 1490750392, 3426149328, 8010922248, 18480112640, 42488361472, 99015558792, 228939593928 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A206206

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 10*a(n-3) +5*a(n-4) +a(n-5) +2*a(n-8) +2*a(n-10) for n>18

EXAMPLE

Some solutions for n=4

..0..3..1..1....0..2..1..1....3..3..1..0....0..0..2..2....1..0..0..0

..0..1..1..1....0..1..1..1....3..3..3..0....0..0..1..1....0..0..0..1

..1..1..1..3....1..1..1..0....1..3..3..3....0..1..1..1....0..0..1..1

..1..1..2..2....1..1..2..2....2..2..3..3....0..1..1..0....0..1..1..1

..1..2..2..2....1..2..2..2....2..2..2..2....0..0..0..0....0..1..1..0

CROSSREFS

Sequence in context: A031672 A031540 A135795 * A237900 A221118 A155023

Adjacent sequences:  A206198 A206199 A206200 * A206202 A206203 A206204

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified September 26 02:27 EDT 2021. Contains 347664 sequences. (Running on oeis4.)