a(n) = Sum_{i=0..n} digsum_7(i)^4, where digsum_7(i) = A053828(i).

Terms

a(0) =0a(1) =1a(2) =17a(3) =98a(4) =354a(5) =979a(6) =2275a(7) =2276a(8) =2292a(9) =2373a(10) =2629a(11) =3254a(12) =4550a(13) =6951a(14) =6967a(15) =7048a(16) =7304a(17) =7929a(18) =9225a(19) =11626a(20) =15722a(21) =15803a(22) =16059a(23) =16684a(24) =17980a(25) =20381a(26) =24477a(27) =31038a(28) =31294a(29) =31919