A054962 - OEIS

%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