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A184380 1/12 the number of (n+2)X5 0..2 arrays with each 3X3 subblock containing three of each value 1
2174, 4281, 8936, 21473, 73139, 280347, 1245641, 6472317, 35048783, 197315495, 1149172427, 6748374453, 39939829709, 238066583421, 1421498562731, 8502133995503, 50933924269739, 305252375007597, 1830126491938301 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A184386

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

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 4X5

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

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

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

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

CROSSREFS

Sequence in context: A251951 A126844 A235861 * A252238 A237303 A283346

Adjacent sequences:  A184377 A184378 A184379 * A184381 A184382 A184383

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2011

STATUS

approved

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Last modified September 15 14:04 EDT 2019. Contains 327078 sequences. (Running on oeis4.)