a(n) = 256n^2 - 828n + 656 (n>=1).

Terms

a(0) =84a(1) =24a(2) =476a(3) =1440a(4) =2916a(5) =4904a(6) =7404a(7) =10416a(8) =13940a(9) =17976a(10) =22524a(11) =27584a(12) =33156a(13) =39240a(14) =45836a(15) =52944a(16) =60564a(17) =68696a(18) =77340a(19) =86496a(20) =96164a(21) =106344a(22) =117036a(23) =128240a(24) =139956a(25) =152184a(26) =164924a(27) =178176a(28) =191940a(29) =206216