Partial sums of A003136.

Terms

a(0) =0a(1) =1a(2) =4a(3) =8a(4) =15a(5) =24a(6) =36a(7) =49a(8) =65a(9) =84a(10) =105a(11) =130a(12) =157a(13) =185a(14) =216a(15) =252a(16) =289a(17) =328a(18) =371a(19) =419a(20) =468a(21) =520a(22) =577a(23) =638a(24) =701a(25) =765a(26) =832a(27) =905a(28) =980a(29) =1056