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%I M4720 #17 Oct 24 2023 21:52:32
%S 0,10,60,595,4512,44802,457040,5159517,62939040,829049884,11727029860,
%T 177384144795,2857827179200,48865616001564,883930234491000,
%U 16866107046572417,338568863790331200,7132984247370166710,157374949769998613708
%N Hit polynomials, coefficient of y^2 in N_n(y).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H Earl Glen Whitehead, Jr., <a href="https://doi.org/10.1017/S1446788700012337">Four-discordant permutations</a>, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.
%K nonn
%O 4,2
%A _N. J. A. Sloane_
%E More terms from _Sean A. Irvine_, Dec 29 2015
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