1,3
G.f.: x(1+x+6x^2)/((1-x)(1-x^3)).
(PARI) a(n)=n+n\3*5
Sequence in context: A043059 A001560 A050569 this_sequence A037456 A019511 A103190
Adjacent sequences: A047466 A047467 A047468 this_sequence A047470 A047471 A047472
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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