a(n) = 44*n^2 - 1.

Terms

a(0) =43a(1) =175a(2) =395a(3) =703a(4) =1099a(5) =1583a(6) =2155a(7) =2815a(8) =3563a(9) =4399a(10) =5323a(11) =6335a(12) =7435a(13) =8623a(14) =9899a(15) =11263a(16) =12715a(17) =14255a(18) =15883a(19) =17599a(20) =19403a(21) =21295a(22) =23275a(23) =25343a(24) =27499a(25) =29743a(26) =32075a(27) =34495a(28) =37003a(29) =39599