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 A133914 #23 Jul 24 2024 07:42:10 %S A133914 1,3,5,11,23,44,89,177,355,711,1420,2841,5683,11367,22731,45463,90925, %T A133914 181851,363703,727404,1454809,2909617,5819235,11638471,23276940, %U A133914 46553881,93107763,186215527,372431051,744862103,1489724205,2979448411,5958896823,11917793644 %N A133914 Row sums of triangle A133913. %F A133914 a(n) = 2 * a(n-1) + A133912(n). - _Jack W Grahl_, Oct 11 2022 %e A133914 a(4) = 11 = sum of row 4 terms of triangle A133913: (1 + 4 + 4 + 2). %e A133914 a(4) = 11 = 2*a(3) + A133912(4) = 2*5 + 1, where A133912 = (1, 1, -1, 1, 1, -2, 1, -1, ...), first finite difference row of A007001. %Y A133914 Cf. A007001, A133912, A133913. %K A133914 nonn %O A133914 1,2 %A A133914 _Gary W. Adamson_, Sep 28 2007 %E A133914 More terms from _Jack W Grahl_, Oct 11 2022