1,2

a(n) = ((15*n+4)*2^(n-1)-2*(3*n+1)*(-1)^n)/27.

Cf. A066967, A073371.

Sequence in context: A058858 A073307 A064009 this_sequence A114723 A153335 A119853

Adjacent sequences: A102710 A102711 A102712 this_sequence A102714 A102715 A102716

easy,nonn

Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 06 2005