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%I #6 May 19 2015 16:08:58
%S 5,18,58,179,537,1571,4587,13343
%N Second column of array in A235610.
%H John Tromp, <a href="http://tromp.github.io/c4/c4.html">John's Connect Four Playground</a>, viewed Jan 23 2014.
%Y Cf. A235610.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Jan 23 2014
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