a(n) = n! * [x^n] (exp(x)+x^2/2!)^n.

A245493

a(n) = n! * [x^n] (exp(x)+x^2/2!)^n.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =45a(4) =508a(5) =7225a(6) =126306a(7) =2606065a(8) =62075952a(9) =1675774089a(10) =50565938050

External references