A039927 Number of types of maximal mixed orthogonal arrays with n runs.

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 2, 1, 2, 1, 4, 1, 1, 1

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• nice
• more

Comments

Number of dual atoms in lattice of parameters of mixed orthogonal arrays with n runs and strength 2.

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

Cf. A039930, A039931.

Extensions

Needs to be updated using the results of Schoen et al. (2010). - N. J. A. Sloane, Feb 21 2013