a(n) = (10*n + 4)^2.

Terms

a(0) =16a(1) =196a(2) =576a(3) =1156a(4) =1936a(5) =2916a(6) =4096a(7) =5476a(8) =7056a(9) =8836a(10) =10816a(11) =12996a(12) =15376a(13) =17956a(14) =20736a(15) =23716a(16) =26896a(17) =30276a(18) =33856a(19) =37636a(20) =41616a(21) =45796a(22) =50176a(23) =54756a(24) =59536a(25) =64516a(26) =69696a(27) =75076a(28) =80656a(29) =86436