Averages of four consecutive cubes.

Terms

a(0) =2a(1) =9a(2) =25a(3) =56a(4) =108a(5) =187a(6) =299a(7) =450a(8) =646a(9) =893a(10) =1197a(11) =1564a(12) =2000a(13) =2511a(14) =3103a(15) =3782a(16) =4554a(17) =5425a(18) =6401a(19) =7488a(20) =8692a(21) =10019a(22) =11475a(23) =13066a(24) =14798a(25) =16677a(26) =18709a(27) =20900a(28) =23256a(29) =25783