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 A090549 #5 Dec 05 2013 19:56:38 %S A090549 1,1,2,6,6,30,30,72,72,210,132,132,114,594,48 %N A090549 Common difference of arithmetic progression in n-th row of A090548 and A113470. %C A090549 In case there was more than one solution with minimum A090548(n), the one with minimum stride A090549(n) was selected to generate A090547(n) and A090549(n). - _R. J. Mathar_, Apr 28 2007 %F A090549 A090548(n)=A090547(n)+(n-1)*a(n). - _R. J. Mathar_, Apr 28 2007 %Y A090549 Cf. A087308, A090547, A090548, A113470. %K A090549 nonn %O A090549 1,3 %A A090549 _Amarnath Murthy_, Dec 09 2003 %E A090549 Corrected and extended by _R. J. Mathar_, Apr 28 2007