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

A293138

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =72a(5) =480a(6) =3780a(7) =35280a(8) =372960a(9) =4263840a(10) =54432000a(11) =758419200a(12) =11436163200a(13) =185253868800

External references