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Duplicate of A099121.
0

%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