Number of 3 X 3 symmetric matrices over Z(n) having determinant 0.

Terms

a(0) =1a(1) =36a(2) =261a(3) =1408a(4) =3225a(5) =9396a(6) =17101a(7) =47104a(8) =76545a(9) =116100a(10) =162261a(11) =367488a(12) =373321a(13) =615636a(14) =841725a(15) =1638400a(16) =1424481a(17) =2755620a(18) =2482597a(19) =4540800a(20) =4463361a(21) =5841396a(22) =6447981a(23) =12294144a(24) =11640625a(25) =13439556a(26) =18954729a(27) =24078208a(28) =20534697a(29) =30302100