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%I #8 Aug 03 2016 11:52:09
%S 1,2,4,14,46,152,500,1648,5506,18380,61512,206028,691126
%N Number of terms in n-th order nested Lie bracket.
%C It would be nice to have a formula.
%H J. Beier, M. Olsen, <a href="http://dx.doi.org/10.2140/involve.2014.7.647">A not-so-simple Lie bracket expansion</a>, Involve, a Journal of Mathematics, Vol. 7 (2014), No. 5, 647-655 DOI: 10.2140/involve.2014.7.647.
%Y Cf. A256030.
%K nonn,more
%O 0,2
%A _N. J. A. Sloane_, Mar 13 2015