Partial sums of A008137.

Terms

a(0) =1a(1) =5a(2) =14a(3) =31a(4) =59a(5) =101a(6) =161a(7) =242a(8) =347a(9) =479a(10) =641a(11) =837a(12) =1070a(13) =1343a(14) =1659a(15) =2021a(16) =2433a(17) =2898a(18) =3419a(19) =3999a(20) =4641a(21) =5349a(22) =6126a(23) =6975a(24) =7899a(25) =8901a(26) =9985a(27) =11154a(28) =12411a(29) =13759