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 A259702 #27 Aug 04 2025 09:01:39 %S A259702 0,0,0,1,2,9,21,78,199,699,1889,6491,18261,62145,180091,610220, %T A259702 1809045,6118849,18469079,62440111,191235803,646681908,2004592956, %U A259702 6782895492,21239394216,71925883149,227169634741,769998727785,2450045838331,8312417389237,26620229804149 %N A259702 Row sums of A259701 except first column. %H A259702 Albert Sade, <a href="/A000108/a000108_17.pdf">Sur les Chevauchements des Permutations</a>, published by the author, Marseille, 1949. [Annotated scanned copy] %F A259702 a(n) = A000682(n)/2 - A000682(n-1) for n > 2. %t A259702 A000682 = Import["https://oeis.org/A000682/b000682.txt", "Table"][[All, 2]]; %t A259702 a[n_] := If[n <= 2, 0, A000682[[n]]/2 - A000682[[n - 1]]]; %t A259702 a /@ Range[2, 32] (* _Jean-François Alcover_, Sep 03 2019, from A301620 *) %Y A259702 Cf. A259701. %Y A259702 Cf. A301620 (essentially twice this sequence). %K A259702 nonn %O A259702 2,5 %A A259702 _N. J. A. Sloane_, Jul 05 2015 %E A259702 a(12) from _Andrew Howroyd_, Dec 07 2018 %E A259702 More terms (using the terms of A301620) from _Joerg Arndt_, Dec 25 2018