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Erroneous version of A000616.
0

%I #3 Aug 16 2015 16:34:05

%S 2,3,6,22,402,1228158,100507806843728

%N Erroneous version of A000616.

%D J. Sklansky, General synthesis of tributary switching networks, IEEE Trans. Elect. Computers, 12 (1963), 464-469.

%K dead

%O 0,1