a(n) = (8*n + 5)^5.

Terms

a(0) =3125a(1) =371293a(2) =4084101a(3) =20511149a(4) =69343957a(5) =184528125a(6) =418195493a(7) =844596301a(8) =1564031349a(9) =2706784157a(10) =4437053125a(11) =6956883693a(12) =10510100501a(13) =15386239549a(14) =21924480357a(15) =30517578125a(16) =41615795893