0,2

(1/60) [80*2^n - 405*3^n + 384*4^n + (-1)^n].

First differences are in A004057. Pairwise sums are in A016269.

Sequence in context: A160640 A026983 A081279 this_sequence A106393 A139262 A029760

Adjacent sequences: A099107 A099108 A099109 this_sequence A099111 A099112 A099113

nonn

Ralf Stephan, Sep 28 2004