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

Author

Jonathan Vos Post, Aug 15 2007

Keywords

• nonn
• more

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.

Crossrefs

Cf. A048885.

Formula

Empirical g.f.: x / ((x-1)^6*(x+1)*(x^2+x+1)^2). - Colin Barker, Aug 01 2013

Extensions

Name clarified by Andrey Zabolotskiy, Sep 22 2021