Partial sums of A002503.

Terms

a(0) =5a(1) =19a(2) =46a(3) =87a(4) =131a(5) =196a(6) =272a(7) =362a(8) =471a(9) =596a(10) =735a(11) =887a(12) =1042a(13) =1211a(14) =1397a(15) =1586a(16) =1789a(17) =1997a(18) =2206a(19) =2425a(20) =2652a(21) =2882a(22) =3119a(23) =3384a(24) =3659a(25) =3957a(26) =4264a(27) =4575a(28) =4889a(29) =5210