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A205819 Number of (n+1) X 5 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases. 1
492, 2430, 12318, 67944, 380568, 2158482, 12281976, 70022628, 399463842, 2279603796, 13010464716, 74259457206, 423858388308, 2419327070832, 13809259294038, 78821939400948, 449908555238976, 2568038752491042 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A205823.

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -18*a(n-2) -83*a(n-3) +264*a(n-4) +171*a(n-5) -1140*a(n-6) +234*a(n-7) +2180*a(n-8) -1280*a(n-9) -1912*a(n-10) +1667*a(n-11) +624*a(n-12) -873*a(n-13) +32*a(n-14) +162*a(n-15) -31*a(n-16) -8*a(n-17) +2*a(n-18).

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A205058 A229520 A226715 * A234672 A234667 A231455

Adjacent sequences:  A205816 A205817 A205818 * A205820 A205821 A205822

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 01 2012

STATUS

approved

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Last modified October 4 21:22 EDT 2022. Contains 357240 sequences. (Running on oeis4.)