a(n) = (11*n + 2)^4.

Terms

a(0) =16a(1) =28561a(2) =331776a(3) =1500625a(4) =4477456a(5) =10556001a(6) =21381376a(7) =38950081a(8) =65610000a(9) =104060401a(10) =157351936a(11) =228886641a(12) =322417936a(13) =442050625a(14) =592240896a(15) =777796321a(16) =1003875856a(17) =1275989841a(18) =1600000000a(19) =1982119441a(20) =2428912656a(21) =2947295521a(22) =3544535296a(23) =4228250625a(24) =5006411536a(25) =5887339441