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%I
%S 0,1,1,4,1,3,1,9,5,3,1,12,1,3,3,21,1,10,1,20,3,3,1,25,7,3,15,28,1,5,1,
%T 42,3,3,3
%N Height of lattice of parameters of mixed orthogonal arrays with n runs and strength 2.
%D A. S. Hedayat, N. J. A. Sloane and J. Stufken, Orthogonal Arrays, Springer-Verlag, NY, 1999.
%D Eric D. Schoen, Pieter T. Eendebak and Man V. M. Nguyen, Complete enumeration of pure-level and mixed-level orthogonal arrays, Journal of Combinatorial Designs, Volume 18, Issue 2, pages 123-140, March 2010; DOI: 10.1002/jcd.20236; Correction: Journal of Combinatorial Designs, Volume 18, Issue 6, page 488, November 2010; DOI: 10.1002/jcd.20270.
%H E. M. Rains, N. J. A. Sloane and J. Stufken, The Lattice of N-Run Orthogonal Arrays, J. Stat. Planning Inference, 102 (2002), 477-500 (<a href="http://neilsloane.com/doc/rao.txt">Abstract</a>, <a href="http://neilsloane.com/doc/rao.pdf">pdf</a>, <a href="http://neilsloane.com/doc/rao.ps">ps</a>)
%Y Cf. A039927, A039931, A048638.
%K nonn,nice
%O 1,4
%A _N. J. A. Sloane_.
%E a(36) is the first unknown term.
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