Sum of squared factorials: (0!)^2 + (1!)^2 + (2!)^2 + (3!)^2 +...+ (n!)^2.

A061062

Sum of squared factorials: (0!)^2 + (1!)^2 + (2!)^2 + (3!)^2 +...+ (n!)^2.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =42a(4) =618a(5) =15018a(6) =533418a(7) =25935018a(8) =1651637418a(9) =133333531818

External references