%I #8 Nov 27 2016 21:19:46
%S 0,4,92,156,284,412,604,796,1052,1244,1628,1948,2204,2588,3164,3420,
%T 3932,4444,5020,5596,6108,6492,7452,8156,8668,9308,10460,11036,11804,
%U 12700,13468,14428,15452,16092,17628,18396,19164,20316,22044
%N Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 2.
%C See A210000 for a guide to related sequences.
%H Chai Wah Wu, <a href="/A209984/b209984.txt">Table of n, a(n) for n = 0..10000</a>
%e a(1) counts these matrices (in reduced notation):
%e (-1,-1,1,-1), (-1,1,-1,-1), (1,-1,1,1), (1,1,-1,1)
%t (See the Mathematica section at A209981.)
%Y Cf. A210000.
%K nonn
%O 0,2
%A _Clark Kimberling_, Mar 17 2012
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