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%I #28 May 29 2018 21:49:28
%S 1,1,1,1,1,13,120,1680,4200,181440
%N Number of different solutions to problem in A054961.
%D Initial terms computed by Michael B. Greenwald (mbgreen(AT)central.cis.upenn.edu), May 24 2000.
%Y Cf. A304041.
%K nonn,hard,nice,more
%O 0,6
%A _N. J. A. Sloane_, May 24 2000
%E a(8) from _Giovanni Resta_, Mar 30 2006
%E a(9) from _Zhao Hui Du_, Mar 29 2018
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