2,1

G.f.: [2x^2(1+x+x^2)]/[(1-x)(1-x-x^2-x^3)]. Cf. A008937.

A027024(n) + 1.

Sequence in context: A161212 A033547 A050531 this_sequence A123991 A112511 A063452

Adjacent sequences: A027080 A027081 A027082 this_sequence A027084 A027085 A027086

nonn

Clark Kimberling (ck6(AT)evansville.edu)