Partial sums of A006010.

Terms

a(0) =0a(1) =1a(2) =6a(3) =26a(4) =78a(5) =195a(6) =420a(7) =820a(8) =1476a(9) =2501a(10) =4026a(11) =6222a(12) =9282a(13) =13447a(14) =18984a(15) =26216a(16) =35496a(17) =47241a(18) =61902a(19) =80002a(20) =102102a(21) =128843a(22) =160908a(23) =199068a(24) =244140a(25) =297037a(26) =358722a(27) =430262a(28) =512778a(29) =607503