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A366427 a(n) = denominator(denominator(Bernoulli''(n, x)) / denominator(Bernoulli(n, 1))).

%I A366427 #10 Oct 14 2023 13:12:37
%S A366427 1,2,6,1,30,1,42,1,10,1,66,1,2730,1,2,1,510,1,798,1,110,1,138,1,546,1,
%T A366427 2,1,870,1,14322,1,170,1,6,1,1919190,1,2,1,13530,1,1806,1,46,1,282,1,
%U A366427 1326,1,22,1,1590,1,798,1,290,1,354,1,56786730,1,2,1,102,1
%N A366427 a(n) = denominator(denominator(Bernoulli''(n, x)) / denominator(Bernoulli(n, 1))).
%F A366427 a(n) = denominator(A366168(n) / A027642(n)).
%p A366427 seq(denom(denom(diff(diff(bernoulli(n, x), x),x))/denom(bernoulli(n, 1))), n = 0..65);
%o A366427 (PARI) a(n) = denominator(lcm(apply(denominator, Vec(deriv(deriv(bernpol(n))))))/denominator(subst(bernpol(n, x), x, 1))); \\ _Michel Marcus_, Oct 14 2023
%Y A366427 Cf. A366168/A027642, A366426 (numerator), A366570/A366152 (1st derivative).
%K A366427 nonn,frac
%O A366427 0,2
%A A366427 _Peter Luschny_, Oct 13 2023