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%I #15 Dec 26 2015 02:02:19
%S 0,1,0,1,2,0,2,0,1,0,1,0,1,0,1,0,2,0,1,0,2,0,1,0,2,0,1,0,2,0,1,0,1,0,
%T 1,0,2,0,1,0,1,0,1,0,2,0,1,0,1,0,1,0,2,0,1,0,1,0,1,0,2,0,1,0,2,0,1,0,
%U 2,0,1,0,1,0
%N Sprague-Grundy sequence G(i-Mark({1}, {2})).
%H Eric Sopena, <a href="http://arxiv.org/abs/1509.04199">i-Mark: A new subtraction division game</a>, arXiv:1509.04199 [cs.DM], 2015.
%F a(n)=0 iff n=0, n=2, or n>=5 is odd.
%F a(n)=1 iff n=3*2^k for even k>0 or n=(2*j+1)*2^k for integers j>1 and odd k.
%F a(n)=2 otherwise.
%K nonn
%O 0,5
%A _N. J. A. Sloane_, Oct 29 2015
%E More terms and formula from _Nathan Fox_, Dec 22 2015
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