A226263 Number of additive Z_2 Z_8 codes of a certain type (see Siap-Aydogdu for precise definition).

6, 560, 714240, 13158776832, 3664870461407232, 15851823599503498280960, 1080418693368712791570241290240, 1169153808560040142520024286639230550016, 20164369771081510946277302795802821049707120295936, 5553565410774406546950324330177622130219698528711309315276800

Offset

1,1

Comments

N2×8(r, 2k; r, k, 0, k) for k>=1 and r>=1. It appears that for a given k, all r yield the same value. (Siap-Aydogdu Table 1)

Links

Lars Blomberg, Table of n, a(n) for n = 1..30

I. Siap and I. Aydogdu, Counting The Generator Matrices of Z_2 Z_8 Codes, arXiv preprint arXiv:1303.6985 [math.CO], 2013.

Mathematica

QP = QPochhammer;
a[n_] := 2^(6n^2+n) QP[4^-n, 2, n]/(2^n (16^n)^n QP[2^-n, 2, n]);
Array[a, 10] (* Jean-François Alcover, Sep 01 2018 *)

Crossrefs

Cf. A226262, A226264, A226265, A226266, A226267, 1.A226268

Sequence in context: A213959 A358487 A341871 * A029590 A374360 A332156

Adjacent sequences: A226260 A226261 A226262 * A226264 A226265 A226266

Keyword

nonn

Author

N. J. A. Sloane, Jun 02 2013

Extensions

Terms a(5) and beyond from Lars Blomberg, Jun 14 2017

Status

approved