0,3

(PARI) {a(n)=local(A2=vector(n+1, m, sum(k=0, m-1, 3^((m-k-1)*(m+k-2)/2)))); Vec(Ser(A2)^(1/2))[n+1]}

Sequence in context: A113871 A092251 A064570 this_sequence A065072 A088389 A094000

Adjacent sequences: A117261 A117262 A117263 this_sequence A117265 A117266 A117267

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Mar 14 2006