E.g.f.: Sum_{n>=0} (1 - exp(-n^2*x))^n.A187755E.g.f.: Sum_{n>=0} (1 - exp(-n^2*x))^n.Terms a(0) =1a(1) =1a(2) =31a(3) =3991a(4) =1340251a(5) =929043391External referencesoeis: A187755