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 A236754 #8 Feb 02 2014 10:58:40 %S A236754 1,0,6,8,120,0,5040,4608,362880,0,39916800 %N A236754 Number of irregular spirals (non-expanded loop) appearing with n center points. %C A236754 See A236535 for construction rule. %C A236754 Conjecture: (1) For odd n all forms are non-expanded loops and equal to n!. (2) For n mod 4 = 0, there are both non-expanded loops and expanded spirals. %H A236754 Kival Ngaokrajang, <a href="/A236754/a236754.pdf">Illustration of irregular spirals, center points = 1..6</a> %H A236754 Kival Ngaokrajang, <a href="/A236754/a236754.txt">Small Basic program</a> %Y A236754 Cf. A014105 (2 center points); A234902, A234903, A234904, A236535 (3 center points); A235088, A235089 (4 center points); A236326, A236327 (5 center points). %K A236754 nonn,more %O A236754 1,3 %A A236754 _Kival Ngaokrajang_, Jan 30 2014