a(n) = (12*n + 2)^2.

Terms

a(0) =4a(1) =196a(2) =676a(3) =1444a(4) =2500a(5) =3844a(6) =5476a(7) =7396a(8) =9604a(9) =12100a(10) =14884a(11) =17956a(12) =21316a(13) =24964a(14) =28900a(15) =33124a(16) =37636a(17) =42436a(18) =47524a(19) =52900a(20) =58564a(21) =64516a(22) =70756a(23) =77284a(24) =84100a(25) =91204a(26) =98596a(27) =106276a(28) =114244a(29) =122500