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 A088217 #15 Dec 23 2024 13:44:32
%S A088217 1,6,777,79455,13602389,3722956267
%N A088217 Number of distinct values that can be assumed by the determinant of an n X n matrix whose entries are all permutations of the numbers 1..n^2.
%C A088217 a(5) = 1 + 2*(A085000(5) - (number of terms of A088238)).
%e A088217 a(2)=6 because the determinants of the 24 2 X 2 matrices whose entries are all permutations of 1,2,3,4 can only assume the values -10,-5,-2,2,5,10.
%t A088217 f[n_] := (p = Permutations[ Table[i, {i, n^2}]]; Length[ Union[ Table[ Det[ Partition[ p[[i]], n]], {i, 1, (n^2)!}]]]) (* _Robert G. Wilson v_ *)
%o A088217 (Fortran) C See link given in A088238.
%Y A088217 Cf. A085000, A088214, A088215, A088216, A088238, A325900.
%K A088217 nonn,more,hard
%O A088217 1,2
%A A088217 _Hugo Pfoertner_, Sep 23 2003
%E A088217 Minor edits and a(6) from _Hugo Pfoertner_, Sep 08 2019