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 A047832 #16 Dec 03 2018 06:23:58
%S A047832 2,36,5600,11220000,293293716992,102484848265030656,
%T A047832 491247277315343649710080,32966971058719932671168222859264,
%U A047832 31464896751148469761776612436741418123264,432450241375084625203842385525712986695638650716160
%N A047832 Number of self-complementary binary relations on a 2n-element set.
%H A047832 Andrew Howroyd, <a href="/A047832/b047832.txt">Table of n, a(n) for n = 1..40</a>
%H A047832 D. Wille, <a href="https://doi.org/10.1016/0095-8956(78)90034-5">Enumeration of self-complementary structures</a>, J. Comb. Theory B 25 (1978) 143-150.
%F A047832 a(n) = A000171(4*n+1).
%t A047832 Needs["Combinatorica`"]; Table[ Print[an = GraphPolynomial[4*n + 1, x] /. x -> -1]; an, {n, 1, 9}] (* _Jean-François Alcover_, Aug 12 2013 *)
%Y A047832 Cf. A000171.
%K A047832 nonn,nice
%O A047832 1,1
%A A047832 _Vladeta Jovovic_
%E A047832 Terms a(10) and beyond from _Andrew Howroyd_, Sep 17 2018