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Search: id:A048164
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| A048164 |
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a(0)=1, a(n+1)=1+(2^(2^n)+1)*a(n). |
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+0
4
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| 1, 4, 21, 358, 92007, 6029862760, 25898063359598159721, 477734946799221833229035410333259818858, 162564778457687820218065957445498785826947155451688293007128627114802460256107
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n) = height of lattice of orthogonal arrays with 2^2^n runs.
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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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FORMULA
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a(n) converges to nearest integer to c*(2^(2^n)-1), where c = 1.403936827882178... (see A048649).
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CROSSREFS
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Cf. A039930, A048638.
Sequence in context: A006822 A165627 A126458 this_sequence A118909 A158947 A000868
Adjacent sequences: A048161 A048162 A048163 this_sequence A048165 A048166 A048167
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), E. M. Rains
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