0,2

(1/30) [20*2^n - 135*3^n + 144*4^n + (-1)^n].

First differences of A099110.

Sequence in context: A027482 A128554 A032207 this_sequence A081898 A034267 A026752

Adjacent sequences: A004054 A004055 A004056 this_sequence A004058 A004059 A004060

nonn

N. J. A. Sloane (njas(AT)research.att.com).