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A206506 Number of (n+1)X3 0..2 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards 1
549, 7737, 93405, 1020756, 10505604, 103812645, 997160112, 9383642739, 86977382523, 797102746356, 7242496383288, 65374662519669, 587135801448765, 5252624153233296, 46849534683131463, 416887973306651277 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A206512

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -108*a(n-2) -116*a(n-3) +2081*a(n-4) -2052*a(n-5) -9023*a(n-6) +14684*a(n-7) +4103*a(n-8) -20511*a(n-9) +25590*a(n-10) -24138*a(n-11) -683*a(n-12) +30616*a(n-13) -32567*a(n-14) +8765*a(n-15) -850*a(n-16) +4935*a(n-17) +9392*a(n-18) -14485*a(n-19) +4202*a(n-20) +738*a(n-21) -1528*a(n-22) +1448*a(n-23) -608*a(n-24) +96*a(n-25)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A136928 A249297 A245957 * A235829 A235834 A235585

Adjacent sequences:  A206503 A206504 A206505 * A206507 A206508 A206509

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 08 2012

STATUS

approved

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Last modified January 26 14:25 EST 2021. Contains 340439 sequences. (Running on oeis4.)