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%I #9 Jul 02 2018 03:12:33
%S -1,1,4,14,16,-400,-5312,-33040,134400,7141632,104530944,438163968,
%T -19703033856,-615381651456,-8122606469120,54420468856832,
%U 5822016615940096,150504948558528512,1126972987747336192,-72753308251479212032
%N Normalized sequence of cumulants formed from moments in a quantum many-body problem at its critical point.
%H Sean A. Irvine, <a href="/A011859/b011859.txt">Table of n, a(n) for n = 1..100</a>
%F a(n) = (-4)^n / (2 * Pi) * Integral_{x=-oo..oo} sech(x) * tanh^n(x) * (d^(n-1) / dx^(n-1)) tanh(x) dx. [Corrected and improved by _Sean A. Irvine_, Jul 02 2018]
%K sign
%O 1,3
%A Nick Witte (nsw(AT)allegro.ph.unimelb.EDU.AU)
%E More terms from _Sean A. Irvine_, Jul 02 2018