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 A373915 #9 Apr 26 2025 01:29:20
%S A373915 89,94,95,97,98,99,101,102,105,110,116,125,144
%N A373915 Determinants of symmetric real {0,1}-matrices of order 9 that only occur as positive values.
%C A373915 The non-occurrence of the corresponding negative determinants causes the difference A089472(9) - A118985(9) = 227 - 214 = 13.
%C A373915 A similar situation already occurs for 7 X 7 matrices, where the 3 determinant values -20, -24, -32 only occur with negative signs.
%H A373915 Hugo Pfoertner, <a href="/A373915/a373915.txt">Examples of 9 X 9 matrices with determinants = a(n)</a>.
%Y A373915 Cf. A003432, A089472, A108150, A118985.
%K A373915 nonn,fini,full
%O A373915 1,1
%A A373915 _Hugo Pfoertner_, Jun 23 2024