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%I #11 Apr 01 2015 17:33:18
%S 1,1,1,1,2,1,1,2,3,1,1,3,4,4,1,1,3,6,6,5,1,1,4,9,12,9,6,1,1,4,12,18,
%T 29,12,7,1,1,5,15,27,33,30,16,8,1,1,5,18
%N Array read by antidiagonals of covering numbers rho_n(k).
%H B. Babcock and A. van Tuyl, <a href="http://arxiv.org/abs/1109.5847">Revisiting the spreading and covering numbers</a>, arXiv preprint arXiv:1109.5847, 2011
%e Array begins:
%e 1 1 1 1 1 1 1 1 1 1 1 ...
%e 1 2 2 3 3 4 4 5 5 6 6 ...
%e 1 3 4 6 9 12 15 18 23 27 32 ...
%e 4 6 12 18 27 [32-38] ...
%e ...
%Y Row 3 is A202171. Cf. A202175.
%K nonn,tabl
%O 1,5
%A _N. J. A. Sloane_, Dec 13 2011