a(n) = 108*n^2 - 104*n + 20 (n>=1).

Terms

a(0) =24a(1) =244a(2) =680a(3) =1332a(4) =2200a(5) =3284a(6) =4584a(7) =6100a(8) =7832a(9) =9780a(10) =11944a(11) =14324a(12) =16920a(13) =19732a(14) =22760a(15) =26004a(16) =29464a(17) =33140a(18) =37032a(19) =41140a(20) =45464a(21) =50004a(22) =54760a(23) =59732a(24) =64920a(25) =70324a(26) =75944a(27) =81780a(28) =87832a(29) =94100