Sum of orders of all 2 X 2 matrices with entries mod n.

Terms

a(0) =1a(1) =26a(2) =272a(3) =722a(4) =5270a(5) =5260a(6) =37358a(7) =18414a(8) =56216a(9) =95668a(10) =487714a(11) =99796a(12) =1304262a(13) =627046a(14) =593398a(15) =481982a(16) =7044222a(17) =931396a(18) =11570384a(19) =1602940a(20) =4037650a(21) =8694134a(22) =40220524a(23) =2069292a(24) =15855230a(25) =21686124a(26) =13215872a(27) =10948486a(28) =129952894a(29) =10451648