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A039930
Height of lattice of parameters of mixed orthogonal arrays with n runs and strength 2.
4
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, 42, 3, 3, 3
OFFSET
1,4
COMMENTS
a(36) is the first unknown term.
REFERENCES
A. S. Hedayat, N. J. A. Sloane and J. Stufken, Orthogonal Arrays, Springer-Verlag, NY, 1999.
LINKS
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 (Abstract, pdf, ps).
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.
CROSSREFS
KEYWORD
nonn,nice,more
STATUS
approved