A226266 Number of additive Z_2 Z_8 codes of a certain type (see Siap-Aydogdu for precise definition).

504, 486080, 1360627200, 13028011487232, 461548202708533248, 62904245232195703930880, 33630170777556360030742118400, 71219568024522244738221811324420096, 600357043171015092778940374122700581371904, 20193878525098148007889802657546998364965856870400

Offset

1,1

Comments

N2×8(r+1, 2r+1; r, 0, r, r) r>=1. (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^(2n + 1))^n (2^(3n + 2))^n (2^(5n + 3))^n QP[2^(-2n-1), 2, n] QP[2^(-n-1), 2, n]^2)/(2^n^2 (4^n)^n (8^n)^(2n) QP[2^(-n), 2, n]^3);
Array[a, 10] (* Jean-François Alcover, Sep 01 2018 *)

Crossrefs

Cf. A226262, A226263, A226264, A226265, A226267, A226268.

Sequence in context: A278308 A000706 A289637 * A377222 A278371 A278655

Adjacent sequences: A226263 A226264 A226265 * A226267 A226268 A226269

Keyword

nonn

Author

N. J. A. Sloane, Jun 02 2013

Extensions

Terms a(4) and beyond from Lars Blomberg, Jun 14 2017

Status

approved