a(n) = 121*n^2 - 38*n + 3.

Terms

a(0) =86a(1) =411a(2) =978a(3) =1787a(4) =2838a(5) =4131a(6) =5666a(7) =7443a(8) =9462a(9) =11723a(10) =14226a(11) =16971a(12) =19958a(13) =23187a(14) =26658a(15) =30371a(16) =34326a(17) =38523a(18) =42962a(19) =47643a(20) =52566a(21) =57731a(22) =63138a(23) =68787a(24) =74678a(25) =80811a(26) =87186a(27) =93803a(28) =100662a(29) =107763