13 times the squares: a(n) = 13*n^2.

Terms

a(0) =0a(1) =13a(2) =52a(3) =117a(4) =208a(5) =325a(6) =468a(7) =637a(8) =832a(9) =1053a(10) =1300a(11) =1573a(12) =1872a(13) =2197a(14) =2548a(15) =2925a(16) =3328a(17) =3757a(18) =4212a(19) =4693a(20) =5200a(21) =5733a(22) =6292a(23) =6877a(24) =7488a(25) =8125a(26) =8788a(27) =9477a(28) =10192a(29) =10933