0,3

a(n) = Sum_{k=0..n-1} 2^(k*(n-1-k))*a(k)*a(n-1-k) for n>0 with a(0)=1.

Cf. A118024.

Sequence in context: A125812 A093657 A006117 this_sequence A119966 A002047 A126340

Adjacent sequences: A118022 A118023 A118024 this_sequence A118026 A118027 A118028

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Apr 10 2006