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%I #2 Mar 30 2012 17:27:23
%S 1,1,2,10,280,1173468
%N Column sums of triangle A171871
%C Next term is known to be greater than 220146725295227, based on link between A171871 and A039754.
%H R. Munafo, <a href="http://mrob.com/pub/math/seq-a005646.html">Classifications of N Elements</a>
%K nonn
%O 0,3
%A _Robert Munafo_, Jan 21 2010