Nearest integer to 4 * Pi * n^3 / 3.

Terms

a(0) =0a(1) =4a(2) =34a(3) =113a(4) =268a(5) =524a(6) =905a(7) =1437a(8) =2145a(9) =3054a(10) =4189a(11) =5575a(12) =7238a(13) =9203a(14) =11494a(15) =14137a(16) =17157a(17) =20580a(18) =24429a(19) =28731a(20) =33510a(21) =38792a(22) =44602a(23) =50965a(24) =57906a(25) =65450a(26) =73622a(27) =82448a(28) =91952a(29) =102160