Partial sums of A039765.

Terms

a(0) =0a(1) =0a(2) =4a(3) =35a(4) =275a(5) =2206a(6) =18602a(7) =166191a(8) =1574415a(9) =15788974a(10) =167183914a(11) =1863967135a(12) =21822793215a(13) =267611755414