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 A133546 #11 Feb 11 2022 17:45:18 %S A133546 1,4,12,31,74,169,376,823,1782,3829,8180,17395,36850,77809,163824, %T A133546 344047,720878,1507309,3145708,6553579,13631466,28311529,58720232, %U A133546 121634791,251658214,520093669,1073741796,2214592483,4563402722 %N A133546 Binomial transform of [1,3,5,6,7,8,9,10,11,...] (i.e., positive integers except 2 and 4). %C A133546 Row sums of triangle A133545. %H A133546 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (6,-13,12,-4). %F A133546 G.f.: x*((1-2*x+x^2-x^3)/((x-1)^2*(2*x-1)^2)). %e A133546 a(3) = 12 = sum of row 3 terms of triangle A133545: (6+5+1). %e A133546 a(4) = 31 = (1,3,3,1) dot (1,3,5,6) = (1+9+15+6). %Y A133546 Cf. A133545. %K A133546 nonn,easy %O A133546 1,2 %A A133546 _Gary W. Adamson_, Sep 15 2007 %E A133546 Extended, edited and formula added by _Olivier Gérard_, Oct 12 2007