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 A374620 #6 Jul 15 2024 10:20:20
%S A374620 1,1,1,2,6,24,120,717,5040,40314,362874
%N A374620 a(n) is the number of distinct values of the determinant of an n X n symmetric Toeplitz matrix having 0 on the main diagonal and all the first n-1 primes off-diagonal.
%H A374620 Wikipedia, <a href="http://en.wikipedia.org/wiki/Toeplitz_matrix">Toeplitz Matrix</a>.
%F A374620 a(n) <= (n-1)! for n > 0.
%t A374620 a[n_]:=CountDistinct[Table[Det[ToeplitzMatrix[Join[{0},Part[Permutations[Prime[Range[n-1]]], i]]]], {i, (n -1)!}]]; Join[{1}, Array[a, 10]]
%Y A374620 Cf. A000142, A369832.
%Y A374620 Cf. A374386, A374387, A374388, A374389.
%Y A374620 Cf. A374617, A374618, A374619, A374621.
%K A374620 nonn,hard,more
%O A374620 0,4
%A A374620 _Stefano Spezia_, Jul 14 2024