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A180375
1/120 the number of n X 4 arrays of integers in 1..6 with no element or any of its neighbors having the same value.
1
4, 147, 1236, 11586, 100704, 909780, 8061360, 72279888, 644409672, 5763665256, 51460343508, 459865182720, 4107418650972, 36696235666668, 327803328407400, 2928457191806580, 26160556962790800, 233703185202652428
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A159197 A246961 A331868 * A160470 A350985 A269136
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 01 2010
STATUS
approved