%I #6 Jan 17 2020 23:02:19
%S 1,3,21,220,3060,53130,1107568,26978328,752538150,23667689815,
%T 828931106355,32006008361808,1350990969850340,61902409203193230,
%U 3060335715568296000,162392216278033616560,9206887338937200407418
%N Duplicate of A099121.
%K dead
%O 0,2
%A _Paul D. Hanna_, Jun 04 2005