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%I #9 Mar 30 2012 18:41:12
%S 10,33,160,145,1008,385,2560,2673,7120,1441,16128,2353,26320,27585,
%T 40960,5185,81648,7201,113920,97713,155056,12673,258048,90625,299728,
%U 216513,421120,25201,671760,30721,655360,552321,866320,532945,1306368,51985
%N Number of noninvertible 2 X 2 matrices over Z/nZ (determinant is a divisor of 0).
%F a(n) seems to be divisible by n. - _Ralf Stephan_, Sep 01 2003
%F a(n)=n^4-A000252(n). - _T. D. Noe_, Jan 16 2006
%K nonn
%O 2,1
%A _David W. Wilson_
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