%I #12 Mar 07 2015 02:37:54
%S 1,3,18,1452
%N Number of normal play partisan games born on day n.
%C _Dean Hickerson_ and Robert Li found a(3) in 1974.
%D Dan Calistrate, Marc Paulhus and David Wolfe, On the lattice structure of finite games, in More Games of No Chance (Berkeley, CA, 2000), Math. Sci. Res. Inst. Publ., 42, Cambridge Univ. Press, Cambridge, 2002, pp. 25-30.
%D J. H. Conway, On Numbers and Games, Academic Press, NY, 1976.
%e Day 0: 0; day 1: 1 -1 *; day 2, 18: 2 -2 1/2 -1/2 1* -1* +/-1 up upstar down downstar *2 1|* 1|0 1|0,* *|-1 0|-1 0,*|-1.
%Y Cf. A065401, A065407, A047995, A037142.
%K nonn,more
%O 0,2
%A _R. K. Guy_, Nov 23 2001