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%I #8 Sep 16 2015 12:39:09
%S 1,2,12,72,1080,129600,54432000,22861440000,9601804800000,
%T 4032758016000000,18631342033920000000,86076800196710400000000,
%U 5169772619814426624000000000,310496543546054463037440000000000
%N a(n) = denominator of Sum_{k=1..n} 1/k^(n+1-k).
%t Table[Denominator[Sum[1/k^(n + 1 - k), {k, 1, n}]], {n, 1, 20}] (* _Stefan Steinerberger_, May 30 2007 *)
%Y Cf. A130425, A003101.
%K frac,nonn
%O 1,2
%A _Leroy Quet_, May 26 2007
%E More terms from _Stefan Steinerberger_, May 30 2007