Sod_4 - sod_3 + sod_2 - sod_1, where sod_k is the sum of k-th powers of digits of n.

Terms

a(0) =0a(1) =0a(2) =10a(3) =60a(4) =204a(5) =520a(6) =1110a(7) =2100a(8) =3640a(9) =5904a(10) =0a(11) =0a(12) =10a(13) =60a(14) =204a(15) =520a(16) =1110a(17) =2100a(18) =3640a(19) =5904a(20) =10a(21) =10a(22) =20a(23) =70a(24) =214a(25) =530a(26) =1120a(27) =2110a(28) =3650a(29) =5914