Fifth column of triangle A075498.

A075515

Fifth column of triangle A075498.

Terms

    a(0) =1a(1) =45a(2) =1260a(3) =28350a(4) =563031a(5) =10333575a(6) =179866170a(7) =3016747800a(8) =49263275061a(9) =788796913905

External references