a(n) = (10*n)^4.

Terms

a(0) =0a(1) =10000a(2) =160000a(3) =810000a(4) =2560000a(5) =6250000a(6) =12960000a(7) =24010000a(8) =40960000a(9) =65610000a(10) =100000000a(11) =146410000a(12) =207360000a(13) =285610000a(14) =384160000a(15) =506250000a(16) =655360000a(17) =835210000a(18) =1049760000a(19) =1303210000a(20) =1600000000a(21) =1944810000a(22) =2342560000a(23) =2798410000a(24) =3317760000