A039930 - OEIS

A039930

Height of lattice of parameters of mixed orthogonal arrays with n runs and strength 2.

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

(list; graph; refs; listen; history; text; internal format)

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

Table of n, a(n) for n=1..35.

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. A039927, A039931, A048638.

Sequence in context: A340079 A323072 A055032 * A123251 A368922 A327357

Adjacent sequences: A039927 A039928 A039929 * A039931 A039932 A039933

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane

STATUS

approved