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 A063073 #8 Aug 19 2015 07:04:39
%S A063073 4,256,36,4096,500,82944,9604,2097152,236196,64000000,7086244,
%T A063073 2293235712,250994068,94450499584,10251562500,4398046511104,
%U A063073 474351505988,228509902503936,24524265031204,13107200000000000
%N A063073 Square of determinant of character table of the dihedral group with 2n elements.
%C A063073 For any finite group G with order n we have that if A is the character table then |det(A)|^2 = product i (n/c(i)) where the product is over the conjugacy classes of G: c(i), so by this formula the square of the determinant is an integer (in the case of dihedral groups the characters are real).
%H A063073 Harry J. Smith, <a href="/A063073/b063073.txt">Table of n, a(n) for n=1..200</a>
%F A063073 a(n) = 4 * n^((n+1)/2) if n odd, a(n)= 64 * n^((n+2)/2) if n even. - _Paul Boddington_, Oct 22 2003
%o A063073 (PARI) { for (n=1, 200, if (n%2, a=4 * n^((n+1)/2), a=64 * n^((n+2)/2)); write("b063073.txt", n, " ", a) ) } \\ _Harry J. Smith_, Aug 16 2009
%K A063073 nonn
%O A063073 1,1
%A A063073 Ahmed Fares (ahmedfares(AT)my-deja.com), Aug 03 2001
%E A063073 Missing term included and more terms added by _Harry J. Smith_, Aug 16 2009