The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #6 Nov 09 2013 13:36:04
%S 1,1,7,221,24243
%N Dimensions of the Sylvester subalgebra of the Hopf algebra PMN_1.
%H H. Cheballah, S. Giraudo, R. Maurice, <a href="http://arxiv.org/abs/1306.6605">Combinatorial Hopf algebra structure on packed square matrices</a>, arXiv preprint arXiv:1306.6605, 2013
%K nonn,more
%O 0,3
%A _N. J. A. Sloane_, Nov 09 2013