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%I #10 Sep 19 2015 17:35:28
%S 1,2,7,63,1234,55447,5598861,1280128950,660647962955,770548397261707,
%T 2030049051145980050,12083401651433651945979,
%U 162481813349792588536582997,4935961285224791538367780371090,338752110195939290445247645371206783
%N Duplicate of A006506.
%H R. H. Hardin, <a href="/A181030/b181030.txt">Table of n, a(n) for n = 1..21</a>
%F Conjecture: a(n) = A006506(n-1), n>1. - _R. J. Mathar_, Oct 02 2010
%Y Diagonal of A181031.
%K dead
%O 1,2
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