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 A116977 #15 Jul 14 2022 13:56:44
%S A116977 1,5,28,256,4471,187300,22290203,8267860926
%N A116977 Number of n X n rational {0,1}-matrices of determinant 0, up to row and column permutations.
%H A116977 Miodrag Zivkovic, <a href="https://doi.org/10.1016/j.laa.2005.10.010">Classification of small (0,1) matrices</a>, Linear Algebra and its Applications, 414 (2006), 310-346.
%F A116977 a(n) = A002724(n) - A116976(n). - _Max Alekseyev_, Feb 28 2010
%Y A116977 Cf. A046747, A002724, A116976.
%K A116977 nonn,more
%O A116977 1,2
%A A116977 _Vladeta Jovovic_, Apr 01 2006
%E A116977 a(8) from _Alois P. Heinz_, Jun 30 2022