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%I #8 May 09 2022 09:58:29
%S 1,6,60,2520,20020,1627920,124324200,1694579040,446626220040,
%T 73706596563600,35444732266944,24569517992362200,3290057629552053360,
%U 551042196782556679200,71028805196838414285360
%N Denominator of Sum_{i=n(n-1)/2+1..n(n+1)/2} 1/i.
%o (PARI) a(n) = denominator(sum(i = n*(n-1)/2+1, n*(n+1)/2, 1/i)); \\ _Michel Marcus_, Aug 29 2013
%Y Numerator is in A081971. a(n) is a divisor of A061431(n).
%K nonn,frac
%O 1,2
%A _Dean Hickerson_, Apr 10 2003
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