a(n) = (11*n + 5)^4.

Terms

a(0) =625a(1) =65536a(2) =531441a(3) =2085136a(4) =5764801a(5) =12960000a(6) =25411681a(7) =45212176a(8) =74805201a(9) =116985856a(10) =174900625a(11) =252047376a(12) =352275361a(13) =479785216a(14) =639128961a(15) =835210000a(16) =1073283121a(17) =1358954496a(18) =1698181681a(19) =2097273616a(20) =2562890625a(21) =3102044416a(22) =3722098081a(23) =4430766096a(24) =5236114321a(25) =6146560000