A209988 - OEIS

%I #8 Nov 27 2016 22:27:50

%S 0,0,52,116,364,492,684,876,1260,1452,1836,2156,2668,3052,3628,3884,

%T 4652,5164,5740,6316,7340,7724,8684,9388,10156,10796,11948,12524,

%U 14060,14956,15724,16684,18220,18860,20396,21164,22700,23852,25580

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

%C See A210000 for a guide to related sequences.

%H Chai Wah Wu, <a href="/A209988/b209988.txt">Table of n, a(n) for n = 0..10000</a>

%t (See the Mathematica section at A209981.)

%Y Cf. A210000.

%K nonn

%O 0,3

%A _Clark Kimberling_, Mar 17 2012