a(0) = 1; thereafter a(n) = 5*n^2 - 5*n + 2.

Terms

a(0) =1a(1) =2a(2) =12a(3) =32a(4) =62a(5) =102a(6) =152a(7) =212a(8) =282a(9) =362a(10) =452a(11) =552a(12) =662a(13) =782a(14) =912a(15) =1052a(16) =1202a(17) =1362a(18) =1532a(19) =1712a(20) =1902a(21) =2102a(22) =2312a(23) =2532a(24) =2762a(25) =3002a(26) =3252a(27) =3512a(28) =3782a(29) =4062