Partial sums of A048890.

Terms

a(0) =19a(1) =80a(2) =189a(3) =388a(4) =989a(5) =1650a(6) =2669a(7) =3730a(8) =4821a(9) =5930a(10) =7111a(11) =8712a(12) =10321a(13) =11990a(14) =13689a(15) =15500a(16) =17401a(17) =19400a(18) =25411a(19) =31502a(20) =37603a(21) =43802a(22) =50421a(23) =57082a(24) =63771a(25) =70462a(26) =77361a(27) =84352a(28) =94413a(29) =104482