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A234781 Number of (n+1)X(3+1) 0..3 arrays with no adjacent elements equal and with each 2X2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases 1
3084, 91916, 2761748, 83120724, 2502596188, 75353928188, 2268967605156, 68320694237108, 2057200342508092, 61944247178059100, 1865199913242292132, 56162935264244462548, 1691119155959930890236, 50921198959363203903516 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234786

LINKS

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

FORMULA

Empirical: a(n) = 45*a(n-1) -528*a(n-2) +2592*a(n-3) -5997*a(n-4) +5689*a(n-5) +812*a(n-6) -4760*a(n-7) +1942*a(n-8) +278*a(n-9) -112*a(n-10)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A186470 A322607 A284660 * A045079 A195811 A268578

Adjacent sequences:  A234778 A234779 A234780 * A234782 A234783 A234784

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2013

STATUS

approved

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Last modified October 15 12:31 EDT 2019. Contains 328026 sequences. (Running on oeis4.)