a(n) = (9*n + 5)^2.

Terms

a(0) =25a(1) =196a(2) =529a(3) =1024a(4) =1681a(5) =2500a(6) =3481a(7) =4624a(8) =5929a(9) =7396a(10) =9025a(11) =10816a(12) =12769a(13) =14884a(14) =17161a(15) =19600a(16) =22201a(17) =24964a(18) =27889a(19) =30976a(20) =34225a(21) =37636a(22) =41209a(23) =44944a(24) =48841a(25) =52900a(26) =57121a(27) =61504a(28) =66049a(29) =70756