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 A206704 #22 Apr 18 2021 14:26:47 %S A206704 1,1,1,3,3,12,101,3993 %N A206704 Number of Hadamard matrices of order 4n that are equivalent to their transpose. %C A206704 Number of equivalence classes under row/column permutation and negation that contain the transpose. %H A206704 <a href="/index/Ha#Hadamard">Index entries for sequences related to Hadamard matrices</a> %F A206704 a(n) = 2*A096201(n) - A007299(n). %Y A206704 Cf. A007299, A036297, A096201, A206705. %K A206704 nonn,more %O A206704 1,4 %A A206704 _Brendan McKay_, Feb 11 2012