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A084847
a(n) = 2*3^n+2^(2n-1)*(n-2).
0
1, 4, 18, 86, 418, 2022, 9650, 45334, 209730, 956870, 4312402, 19228662, 84948962, 372287398, 1620178674, 7008019670, 30150864514, 129107299206, 550530654866, 2338786731958, 9902578218786, 41802362561894, 175984622563378
OFFSET
0,2
COMMENTS
Binomial transform of A084643. Third binomial transform of abs(A060747).
FORMULA
G.f.: (1-7x+14x^2)/((1-3x)(1-4x)^2).
CROSSREFS
Sequence in context: A318217 A341248 A151252 * A082685 A111966 A225887
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 09 2003
STATUS
approved