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 A107763 #10 Jul 11 2015 10:24:54 %S A107763 1,1,2,6,12,72,480,864,9600,108000,312000,4795200,46293120,241056000, %T A107763 4759413120,94182359040,478511953920,4873965022080,122634632171520, %U A107763 799554193966080,23063946114908160,664424069072117760,3198456730188840960,108184656752428032000,2657146152621477888000,22850984107452933734400,863305241854715928576000,15282315334192501724774400,151673086024479840160972800 %N A107763 Number of ways to arrange the numbers (1,3,5,7,9,...,2n-1) in a circle such that every two adjacent numbers are relatively prime. %C A107763 Odd analog of A086595. %Y A107763 Cf. A076220, A086595, A102381, A107761, A107762. %K A107763 nonn %O A107763 1,3 %A A107763 _Ray Chandler_, Jun 11 2005 %E A107763 More terms from _Max Alekseyev_, Jun 11 2005 %E A107763 a(23)-a(29) from _Max Alekseyev_, Jul 08 2014