a(n) = 25*n^2 - 14*n + 2.

Terms

a(0) =2a(1) =13a(2) =74a(3) =185a(4) =346a(5) =557a(6) =818a(7) =1129a(8) =1490a(9) =1901a(10) =2362a(11) =2873a(12) =3434a(13) =4045a(14) =4706a(15) =5417a(16) =6178a(17) =6989a(18) =7850a(19) =8761a(20) =9722a(21) =10733a(22) =11794a(23) =12905a(24) =14066a(25) =15277a(26) =16538a(27) =17849a(28) =19210a(29) =20621