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 A029849 #12 Mar 06 2020 03:18:39 %S A029849 1,2,9,74,1740,149572,48575680,56147642904,229149201466592, %T A029849 3333310913116926416,174695272793893644765312, %U A029849 33301710992572083379669646560,23278728241293538748514513208527104 %N A029849 Number of nonisomorphic and nonantiisomorphic relations. %F A029849 a(n) = (A000595(n) + A002500(n)) / 2. - _Sean A. Irvine_, Mar 05 2020 %Y A029849 Cf. A000595, A002500. %K A029849 nonn,nice %O A029849 0,2 %A A029849 _Christian G. Bower_, Jan 15 1998 and Jun 15 1998