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A209852 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 1
182, 2829, 43091, 661963, 10137464, 155490654, 2383064182, 36538359367, 560099384524, 8586845703984, 131635724835755, 2018037972754560, 30936878781499330, 474272812069766100, 7270720913944659218 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A209858

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) +139*a(n-2) -972*a(n-3) -4071*a(n-4) +28751*a(n-5) +27819*a(n-6) -332527*a(n-7) +170449*a(n-8) +1380897*a(n-9) -1533070*a(n-10) -2378942*a(n-11) +3871609*a(n-12) +1392648*a(n-13) -4192842*a(n-14) +445370*a(n-15) +1893206*a(n-16) -633950*a(n-17) -236300*a(n-18) +99664*a(n-19) +2096*a(n-20)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A234982 A234975 A186125 * A321637 A023904 A035839

Adjacent sequences:  A209849 A209850 A209851 * A209853 A209854 A209855

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2012

STATUS

approved

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Last modified August 4 13:21 EDT 2020. Contains 336201 sequences. (Running on oeis4.)