a(n) = Sum_{i=0..n} digsum_9(i)^3, where digsum_9(i) = A053830(i).

Terms

a(0) =0a(1) =1a(2) =9a(3) =36a(4) =100a(5) =225a(6) =441a(7) =784a(8) =1296a(9) =1297a(10) =1305a(11) =1332a(12) =1396a(13) =1521a(14) =1737a(15) =2080a(16) =2592a(17) =3321a(18) =3329a(19) =3356a(20) =3420a(21) =3545a(22) =3761a(23) =4104a(24) =4616a(25) =5345a(26) =6345a(27) =6372a(28) =6436a(29) =6561