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Search: id:A039931
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| A039931 |
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Number of different sets of parameters for mixed orthogonal arrays with n runs and strength 2. |
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+0
3
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| 1, 2, 2, 5, 2, 5, 2, 14, 6, 5, 2, 23, 2, 5, 5, 61, 2, 26, 2, 35, 5, 5, 2
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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A. S. Hedayat, N. J. A. Sloane and J. Stufken, Orthogonal Arrays, Springer-Verlag, NY, 1999.
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LINKS
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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)
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EXAMPLE
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For 12 runs there are 23 different sets of parameters: 12^1, 2^k with 1<=k<=11, 3^1*2^k with 0<=k<=4, 6^1*2^k with 0<=k<=2, 4^1*3^1, 4^1 and 1^1.
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CROSSREFS
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Cf. A039927, A039930.
Sequence in context: A111861 A004543 A076200 this_sequence A128645 A007610 A068066
Adjacent sequences: A039928 A039929 A039930 this_sequence A039932 A039933 A039934
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KEYWORD
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nonn,nice,more
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AUTHOR
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njas
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EXTENSIONS
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a(24) is the first unknown term.
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