n^4 - 1 divided by its largest fourth power divisor.

Terms

a(0) =15a(1) =5a(2) =255a(3) =39a(4) =1295a(5) =150a(6) =4095a(7) =410a(8) =9999a(9) =915a(10) =20735a(11) =1785a(12) =38415a(13) =3164a(14) =65535a(15) =5220a(16) =104975a(17) =8145a(18) =159999a(19) =12155a(20) =234255a(21) =17490a(22) =331775a(23) =24414a(24) =456975a(25) =33215a(26) =614655a(27) =44205a(28) =809999a(29) =57720