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A221335
Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, with every occupancy equal to zero or two
1
0, 20, 0, 790, 0, 34042, 0, 1470618, 0, 63526554, 0, 2744129114, 0, 118536728562, 0, 5120367434418, 0, 221181729631882, 0, 9554266491058090, 0, 412710429318366178, 0, 17827626812331482594, 0, 770090248640353835354, 0
OFFSET
1,2
COMMENTS
Column 3 of A221337
LINKS
FORMULA
Empirical: a(n) = 66*a(n-2) -1131*a(n-4) +6726*a(n-6) -18808*a(n-8) +27860*a(n-10) -19388*a(n-12) +3240*a(n-14)
CROSSREFS
Sequence in context: A008426 A055637 A086684 * A298672 A198800 A060430
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved