a(n) = (10*n + 7)^5.

Terms

a(0) =16807a(1) =1419857a(2) =14348907a(3) =69343957a(4) =229345007a(5) =601692057a(6) =1350125107a(7) =2706784157a(8) =4984209207a(9) =8587340257a(10) =14025517307a(11) =21924480357a(12) =33038369407a(13) =48261724457a(14) =68641485507a(15) =95388992557a(16) =129891985607