a(n) = n^7 + n.

Terms

a(0) =0a(1) =2a(2) =130a(3) =2190a(4) =16388a(5) =78130a(6) =279942a(7) =823550a(8) =2097160a(9) =4782978a(10) =10000010a(11) =19487182a(12) =35831820a(13) =62748530a(14) =105413518a(15) =170859390a(16) =268435472a(17) =410338690a(18) =612220050a(19) =893871758a(20) =1280000020a(21) =1801088562a(22) =2494357910a(23) =3404825470a(24) =4586471448