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%I #32 Apr 22 2016 22:31:20
%S 0,0,1,0,6,20,135,924,7420,66744,667485,7342280,88107426,1145396460,
%T 16035550531,240533257860,3848532125880,65425046139824,
%U 1177650830516985,22375365779822544,447507315596451070,9397653627525472260,206748379805560389951,4755212735527888968620
%N Duplicate of A000387.
%K dead
%O 0,5