# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a373915 Showing 1-1 of 1 %I A373915 #5 Jun 23 2024 14:31:00 %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, Examples of 9 X 9 matrices with determinants = a(n). %Y A373915 Cf. A003432, A089472, A108150, A118985. %K A373915 nonn,fini,full %O A373915 1,1 %A A373915 _Hugo Pfoertner_, Jun 23 2024 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE