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A206056 Number of (n+1)X2 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases 1
256, 2184, 19832, 170688, 1499080, 13136860, 114770680, 1005245456, 8795691276, 76969708228, 673648635636, 5895121182756, 51591036898624, 451495015540276, 3951196323981332, 34578562282564776, 302610603775464632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A206063

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +34*a(n-2) +145*a(n-3) -18*a(n-4) -2*a(n-5) +11*a(n-6) +6*a(n-7) +2*a(n-8) +4*a(n-9) for n>10

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237069 A346961 A206063 * A207799 A207792 A236500

Adjacent sequences:  A206053 A206054 A206055 * A206057 A206058 A206059

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 03 2012

STATUS

approved

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Last modified October 21 18:36 EDT 2021. Contains 348155 sequences. (Running on oeis4.)