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A130145 Number of nonisomorphic orthogonal arrays OA(8*n+4,4,2,2). 0
1, 3, 7, 15, 28, 48, 79, 123, 184, 268, 379, 523, 709, 943, 1234, 1594, 2032, 2560, 3194, 3946, 4832, 5872, 7082, 8482, 10097 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Conjecture: partial sums of A115266. - Sean A. Irvine, Jul 14 2022
LINKS
John Stufken and Boxin Tang, Complete enumeration of two-Level orthogonal arrays of strength d with d+2 constraints, arXiv:0708.1908 [math.ST], 2007.
FORMULA
Empirical g.f.: x / ((x-1)^6*(x+1)*(x^2+x+1)^2). - Colin Barker, Aug 01 2013
CROSSREFS
Cf. A048885.
Sequence in context: A025587 A101498 A027965 * A023552 A293316 A364293
KEYWORD
nonn,more
AUTHOR
Jonathan Vos Post, Aug 15 2007
EXTENSIONS
Name clarified by Andrey Zabolotskiy, Sep 22 2021
STATUS
approved

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)