a(n) = 9*n^2 + 1.

Terms

a(0) =1a(1) =10a(2) =37a(3) =82a(4) =145a(5) =226a(6) =325a(7) =442a(8) =577a(9) =730a(10) =901a(11) =1090a(12) =1297a(13) =1522a(14) =1765a(15) =2026a(16) =2305a(17) =2602a(18) =2917a(19) =3250a(20) =3601a(21) =3970a(22) =4357a(23) =4762a(24) =5185a(25) =5626a(26) =6085a(27) =6562a(28) =7057a(29) =7570