a(n) = 32*n^2 - 56*n + 25.

Terms

a(0) =25a(1) =1a(2) =41a(3) =145a(4) =313a(5) =545a(6) =841a(7) =1201a(8) =1625a(9) =2113a(10) =2665a(11) =3281a(12) =3961a(13) =4705a(14) =5513a(15) =6385a(16) =7321a(17) =8321a(18) =9385a(19) =10513a(20) =11705a(21) =12961a(22) =14281a(23) =15665a(24) =17113a(25) =18625a(26) =20201a(27) =21841a(28) =23545a(29) =25313