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Numerator of Sum(i=1..n-1, 1/i^(2*n-1)).
2

%I #11 Feb 12 2019 08:45:24

%S 0,1,33,282251,5170139875,36297634492764230063,

%T 43540989124396091246149,248033379485570104849994099153187946961,

%U 17204019459451797001978107903201762504044841332131

%N Numerator of Sum(i=1..n-1, 1/i^(2*n-1)).

%C For prime p, p^3 divides a(p), see A130681.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/WolstenholmesTheorem.html">Wolstenholme's Theorem</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HarmonicNumber.html">Harmonic Number</a>

%o (PARI) a(n)=numerator(sum(i=1,n-1,1/i^(2*n-1)))

%Y Denominators are in A228427.

%Y Cf. A001008/A002805.

%K nonn,frac

%O 1,3

%A _Ralf Stephan_, Nov 10 2013