E.g.f.: Product_{m>0} (1+x^m+x^(2*m)/2!+x^(3*m)/3!+x^(4*m)/4!).

A293196

E.g.f.: Product_{m>0} (1+x^m+x^(2*m)/2!+x^(3*m)/3!+x^(4*m)/4!).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =73a(5) =500a(6) =4050a(7) =37590a(8) =393960a(9) =4591440a(10) =58842000a(11) =822729600a(12) =12451546800a(13) =202637635200

External references