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A184452 1/36 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last 1
3159, 4517, 6880, 11766, 28668, 80058, 253176, 1011114, 4109928, 16573530, 76394256, 343071594, 1473267984, 7095859362, 32986799520, 145080603426, 712092090408, 3363516907218, 14962452326376, 74120256227754 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A184457

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..66

FORMULA

Empirical: a(n)=6*a(n-1)-11*a(n-2)+195*a(n-3)-1134*a(n-4)+2079*a(n-5)-11600*a(n-6)+62796*a(n-7)-115126*a(n-8)+263520*a(n-9)-1204344*a(n-10)+2207964*a(n-11)-2907648*a(n-12)+10219824*a(n-13)-18736344*a(n-14)+17243280*a(n-15)-42140736*a(n-16)+77258016*a(n-17)-55857600*a(n-18)+82301184*a(n-19)-150885504*a(n-20)+92378880*a(n-21)-60466176*a(n-22)+110854656*a(n-23)-60466176*a(n-24)

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A276686 A252215 A250760 * A151750 A031610 A252636

Adjacent sequences:  A184449 A184450 A184451 * A184453 A184454 A184455

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2011

STATUS

approved

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Last modified November 27 20:49 EST 2021. Contains 349395 sequences. (Running on oeis4.)