This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A321945 #13 Jan 07 2019 05:55:05 %S A321945 1,1,0,0,0,0,0,0,0,0,0,0,1,9,66,738,10760 %N A321945 Number of binary self-dual codes of length 2n having an automorphism group size that is a prime power. %C A321945 Codes are vector spaces with a metric defined on them. Specifically, the metric is the hamming distance between two vectors. Vectors of a code are called codewords. %C A321945 A code is usually represented by a generating matrix. The row space of the generating matrix is the code itself. %C A321945 Self-dual codes are codes such all codewords are pairwise orthogonal to each other. %C A321945 Two codes are called permutation equivalent if one code can be obtained by permuting the coordinates (columns) of the other code. %C A321945 The automorphism group of a code is the set of permutations of the coordinates (columns) that result in the same identical code. %C A321945 There are codes with a trivial automorphism group of size 1. This sequence does not count those codes. %H A321945 W. Cary Huffman and Vera Pless, <a href="https://doi.org/10.1017/CBO9780511807077">Fundamentals of Error Correcting Codes</a>, 2003, pp. 7, 252-330, 338-393. %e A321945 There are a(17)=10760 binary self-dual codes of length 2*17=34 having an automorphism group size that is a prime power. %Y A321945 Cf. A322299, A322339, A322429. %K A321945 nonn,more %O A321945 1,14 %A A321945 _Nathan J. Russell_, Dec 12 2018