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Number of true systems of magical circles of order n.
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%I #5 Apr 24 2016 12:53:34

%S 0,48,218592

%N Number of true systems of magical circles of order n.

%H C. G. P. Kuschke, <a href="http://dx.doi.org/10.1090/S0002-9904-1934-05950-0">Magic circles</a>, Bull. Amer. Math. Soc. 40 (1934), 709-710.

%Y Cf. A006052.

%K nonn,more,bref

%O 2,2

%A _Michel Marcus_, Apr 24 2016