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A184381 1/12 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing three of each value 1
9113, 13616, 21473, 38642, 104312, 336236, 1348574, 6736118, 35668172, 198726728, 1153450280, 6759631310, 39967552418, 238155498086, 1421741546408, 8502748040192, 50935935695672, 305257947824246, 1830140712020354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A184386

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..74

FORMULA

Empirical: a(n)=12*a(n-1)-47*a(n-2)+186*a(n-3)-1404*a(n-4)+5358*a(n-5)-12815*a(n-6)+59388*a(n-7)-216529*a(n-8)+421074*a(n-9)-1238292*a(n-10)+4200390*a(n-11)-7370532*a(n-12)+14448024*a(n-13)-43986924*a(n-14)+72896760*a(n-15)-99842544*a(n-16)+259089192*a(n-17)-414953280*a(n-18)+415059552*a(n-19)-848382336*a(n-20)+1329975936*a(n-21)-1013741568*a(n-22)+1425340800*a(n-23)-2203656192*a(n-24)+1333615104*a(n-25)-947303424*a(n-26)+1451188224*a(n-27)-725594112*a(n-28)

EXAMPLE

Some solutions with a(1,1)=0 for 4X6

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

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

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

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

CROSSREFS

Sequence in context: A157619 A233713 A174983 * A251376 A253031 A093213

Adjacent sequences:  A184378 A184379 A184380 * A184382 A184383 A184384

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2011

STATUS

approved

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Last modified August 20 03:33 EDT 2019. Contains 326139 sequences. (Running on oeis4.)