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 A236755 #6 Feb 02 2014 10:59:54 %S A236755 0,2,0,16,0,720,0,35712,0,3628800,0 %N A236755 Number of irregular spiral (expanded spiral) appearing with n center points. %C A236755 See A236535 for construction rule. %C A236755 Conjecture: (1) For even n; except n mod 4 = 0; all forms are expanded spirals and equal to n!. (2) For n mod 4 = 0, there are both non-expanded loops and expanded spirals. %H A236755 Kival Ngaokrajang, <a href="/A236755/a236755.pdf">Illustration of irregular spirals, center points = 1..6</a> %H A236755 Kival Ngaokrajang, <a href="/A236755/a236755.txt">Small Basic program</a> %Y A236755 Cf. A014105 (2 center points); A234902, A234903, A234904, A236535 (3 center points); A235088, A235089 (4 center points); A236326, A236327 (5 center points). %K A236755 nonn,more %O A236755 1,2 %A A236755 _Kival Ngaokrajang_, Jan 30 2014