Number of 4 X 4 symmetric magic squares with line sum 2n.

Terms

a(0) =1a(1) =11a(2) =53a(3) =164a(4) =397a(5) =819a(6) =1513a(7) =2576a(8) =4121a(9) =6275a(10) =9181a(11) =12996a(12) =17893a(13) =24059a(14) =31697a(15) =41024a(16) =52273a(17) =65691a(18) =81541a(19) =100100a(20) =121661a(21) =146531a(22) =175033a(23) =207504a(24) =244297a(25) =285779a(26) =332333a(27) =384356a(28) =442261a(29) =506475