A130145 Number of nonisomorphic orthogonal arrays OA(8*n+4,4,2,2).

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

Offset

1,2

Comments

Conjecture: partial sums of A115266. - Sean A. Irvine, Jul 14 2022

Links

Table of n, a(n) for n=1..25.

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

Adjacent sequences: A130142 A130143 A130144 * A130146 A130147 A130148

Keyword

nonn,more

Author

Jonathan Vos Post, Aug 15 2007

Extensions

Name clarified by Andrey Zabolotskiy, Sep 22 2021

Status

approved