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%I #10 Jul 20 2020 16:23:19
%S 1,0,1,4,81,1936,70225,3437316,220017889,17821182016,1782120871521,
%T 215636596084900,31051670188655281,5247732257301156624,
%U 1028555522495168900401,231424992560450869558756,59244798095490816735545025,17121746649596584336387952896
%N A000166(n)^2.
%D I. Kaplansky and J. Riordan, The problème des ménages, Scripta Math. 12, (1946), 113-124. See p. 115.
%H I. Kaplansky and J. Riordan, <a href="/A000166/a000166_1.pdf">The problème des ménages</a>, Scripta Math. 12, (1946), 113-124. [Scan of annotated copy]
%Y Cf. A000166, A335692, A335693.
%K nonn
%O 0,4
%A _N. J. A. Sloane_, Jul 20 2020