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 A100584 #8 Aug 23 2022 09:45:58 %S A100584 1,1,-1,1,0,1,0,3,1,7,4,19,17,63,77,217,326,815,1435,3533,7227,17709, %T A100584 39704,97010,228123,561216,1366962,3423504,8601350,22000341,56612480, %U A100584 147248370,384885631 %N A100584 a(n) = A000676(n) - A000677(n). %H A100584 Jean-François Alcover, <a href="/A100584/b100584.txt">Table of n, a(n) for n = 0..100</a> %F A100584 a(n) = A000055(n) - 2*A000677(n). - _Jean-François Alcover_, Aug 23 2022 %Y A100584 Cf. A000055, A000676, A000677. %K A100584 sign %O A100584 0,8 %A A100584 _N. J. A. Sloane_, Dec 01 2004