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A206057 Number of (n+1)X3 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases 1
2184, 21140, 167960, 1390488, 11638960, 96831504, 805817696, 6714115792, 55902397592, 465476937176, 3876504593184, 32279865472672, 268800887680752, 2238413081414208, 18639806720997144, 155218800036689864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A206063

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +20*a(n-2) +189*a(n-3) +102*a(n-4) +187*a(n-5) -612*a(n-6) -110*a(n-7) +186*a(n-8) +82*a(n-9) +43*a(n-10) -5*a(n-11) -16*a(n-12) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A250628 A234733 A067263 * A130173 A130170 A090318

Adjacent sequences:  A206054 A206055 A206056 * A206058 A206059 A206060

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 03 2012

STATUS

approved

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Last modified June 19 15:47 EDT 2021. Contains 345142 sequences. (Running on oeis4.)