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 A350930 #24 Oct 11 2022 00:54:11 %S A350930 1,1,-5,-42,-1810,-48098,-2737409,-114381074 %N A350930 Minimal determinant of an n X n Toeplitz matrix using the integers 1 to 2*n - 1. %H A350930 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A350930%2B1.py">A350930+1.py</a> %H A350930 Wikipedia, <a href="http://en.wikipedia.org/wiki/Toeplitz_matrix">Toeplitz Matrix</a> %e A350930 a(2) = -5: %e A350930 [1 2] %e A350930 [3 1] %e A350930 a(3) = -42: %e A350930 [3 4 1] %e A350930 [5 3 4] %e A350930 [2 5 3] %o A350930 (Python) %o A350930 from itertools import permutations %o A350930 from sympy import Matrix %o A350930 def A350930(n): return min(Matrix([p[n-1-i:2*n-1-i] for i in range(n)]).det() for p in permutations(range(1,2*n))) # _Chai Wah Wu_, Jan 27 2022 %Y A350930 Cf. A322908, A323254, A350931 (maximal). %K A350930 sign,hard,more %O A350930 0,3 %A A350930 _Stefano Spezia_, Jan 25 2022 %E A350930 a(5) from _Alois P. Heinz_, Jan 25 2022 %E A350930 a(6) from _Pontus von Brömssen_, Jan 26 2022 %E A350930 a(7) from _Lucas A. Brown_, Aug 28 2022