Partial sums of A051797.

Terms

a(0) =1a(1) =13a(2) =63a(3) =203a(4) =518a(5) =1134a(6) =2226a(7) =4026a(8) =6831a(9) =11011a(10) =17017a(11) =25389a(12) =36764a(13) =51884a(14) =71604a(15) =96900a(16) =128877a(17) =168777a(18) =217987a(19) =278047a(20) =350658a(21) =437690a(22) =541190a(23) =663390a(24) =806715a(25) =973791a(26) =1167453a(27) =1390753a(28) =1646968a(29) =1939608