1,1

a(n) = 7*6^((n-1)/2)-2 (n odd), 2*6^(n/2)-2 (n even).

Cf. A050250.

Sequence in context: A073705 A121158 A032772 this_sequence A001692 A038070 A136138

Adjacent sequences: A117862 A117863 A117864 this_sequence A117866 A117867 A117868

nonn

Martin Renner (martin.renner(AT)gmx.net), May 02 2006