A210002 - OEIS

%I #7 Nov 27 2016 21:20:11

%S 0,0,0,4,16,26,44,62,104,122,164,198,256,298,364,390,480,538,604,670,

%T 792,834,948,1030,1120,1194,1332,1398,1584,1690,1780,1894,2080,2154,

%U 2340,2430,2616,2754,2964,3054,3240,3394,3532,3694,4008,4098

%N Number of 2 X 2 matrices having all elements in {1,2,...,n} and determinant 4.

%C See A210000 for a guide to related sequences.

%H Chai Wah Wu, <a href="/A210002/b210002.txt">Table of n, a(n) for n = 0..10000</a>

%t (See the Mathematica section at A209978.)

%Y Cf. A210000.

%K nonn

%O 0,4

%A _Clark Kimberling_, Mar 16 2012