0,4

a(n)=Sum_[k, 0<=k<=n-1}A053121(n-1,k)*a(k)for n>0 with a(0)=1 .

Sequence in context: A091561 A025265 A037245 this_sequence A099754 A105633 A099241

Adjacent sequences: A130015 A130016 A130017 this_sequence A130019 A130020 A130021

nonn

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jun 16 2007