a(n) = floor(n^3 / e).

Terms

a(0) =0a(1) =0a(2) =2a(3) =9a(4) =23a(5) =45a(6) =79a(7) =126a(8) =188a(9) =268a(10) =367a(11) =489a(12) =635a(13) =808a(14) =1009a(15) =1241a(16) =1506a(17) =1807a(18) =2145a(19) =2523a(20) =2943a(21) =3406a(22) =3917a(23) =4475a(24) =5085a(25) =5748a(26) =6465a(27) =7240a(28) =8075a(29) =8972