Partial sums of A062074.

Terms

a(0) =0a(1) =3a(2) =75a(3) =804a(4) =5988a(5) =36363a(6) =193827a(7) =943968a(8) =4303200a(9) =18652107a(10) =77701107a(11) =313483764a(12) =1231813812a(13) =4734541443a(14) =17859008379a(15) =66286569504a(16) =242605938720a(17) =877071559539