Number of 3 X 3 symmetric matrices over Z(n) having determinant 1.

Terms

a(0) =1a(1) =28a(2) =234a(3) =896a(4) =3100a(5) =6552a(6) =16758a(7) =28672a(8) =56862a(9) =86800a(10) =160930a(11) =209664a(12) =371124a(13) =469224a(14) =725400a(15) =917504a(16) =1419568a(17) =1592136a(18) =2475738a(19) =2777600a(20) =3921372a(21) =4506040a(22) =6435814a(23) =6709248a(24) =9687500a(25) =10391472a(26) =13817466a(27) =15015168a(28) =20510308a(29) =20311200