a(n) = Sum_{i=0..n} digsum_8(i)^3, where digsum_8(i) = A053829(i).

Terms

a(0) =0a(1) =1a(2) =9a(3) =36a(4) =100a(5) =225a(6) =441a(7) =784a(8) =785a(9) =793a(10) =820a(11) =884a(12) =1009a(13) =1225a(14) =1568a(15) =2080a(16) =2088a(17) =2115a(18) =2179a(19) =2304a(20) =2520a(21) =2863a(22) =3375a(23) =4104a(24) =4131a(25) =4195a(26) =4320a(27) =4536a(28) =4879a(29) =5391