a(n) = Sum_{i=0..n} digsum(i)^3, where digsum(i) = A007953(i).

Terms

a(0) =0a(1) =1a(2) =9a(3) =36a(4) =100a(5) =225a(6) =441a(7) =784a(8) =1296a(9) =2025a(10) =2026a(11) =2034a(12) =2061a(13) =2125a(14) =2250a(15) =2466a(16) =2809a(17) =3321a(18) =4050a(19) =5050a(20) =5058a(21) =5085a(22) =5149a(23) =5274a(24) =5490a(25) =5833a(26) =6345a(27) =7074a(28) =8074a(29) =9405