E.g.f.: exp(-1)*Sum((1+2*x)^binomial(n,2)/n!, n=0..infinity).

A094089

E.g.f.: exp(-1)*Sum((1+2*x)^binomial(n,2)/n!, n=0..infinity).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =53a(4) =873a(5) =20457a(6) =634541a(7) =24950557a(8) =1203940177a(9) =69583310545

External references