%I
%S 1,2,5,15,49,180,715,3081,14217,69905,363926,1150036,69269925
%N Number of nelement unlabeled Nfree posets of height k (1 <= k <= n).
%D Khamis, Soheir M., Height counting of unlabeled interval and Nfree posets. Discrete Math. 275 (2004), no. 13, 165175.
%Y Row sums of A202181.
%Y From the definition, this sequence should be the same as A003430. I do not understand why they differ  possibly a different definition of "Nfree"?
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Dec 13 2011
