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 A133572 #11 Jun 29 2023 20:02:42 %S A133572 1,4,6,16,24,64,96,256,384,1024,1536,4096,6144,16384,24576,65536, %T A133572 98304,262144,393216,1048576,1572864,4194304,6291456,16777216, %U A133572 25165824,67108864,100663296,268435456,402653184,1073741824,1610612736,4294967296 %N A133572 Row sums of triangle A133571. %H A133572 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0, 4). %F A133572 Even-indexed terms, a(n) = 2^n; odd-indexed terms, a(n) = 2^(n-1) + 2^(n-2). %F A133572 G.f.: -x*(4*x+1+2*x^2)/(2*x-1)/(2*x+1). - _R. J. Mathar_, Nov 14 2007 %e A133572 a(4) = 16 = sum or row 4 terms of triangle A133571: (5 + 5 + 5 + 1). %e A133572 a(4) = 16 = 2^4. %e A133572 a(7) = 96 = 2^6 + 2^5 = 64 + 32. %Y A133572 Cf. A133571. %K A133572 nonn,easy %O A133572 1,2 %A A133572 _Gary W. Adamson_, Sep 16 2007