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 A134067 #31 May 08 2023 09:35:19
%S A134067 1,6,14,30,62,126,254,510,1022,2046,4094,8190,16382,32766,65534,
%T A134067 131070,262142,524286,1048574,2097150,4194302,8388606,16777214,
%U A134067 33554430,67108862,134217726,268435454,536870910,1073741822,2147483646,4294967294,8589934590,17179869182
%N A134067 Row sums of triangle A134066.
%C A134067 Essentially the same as A095121. - _R. J. Mathar_, Mar 28 2012
%H A134067 Vincenzo Librandi, <a href="/A134067/b134067.txt">Table of n, a(n) for n = 0..1000</a>
%H A134067 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2).
%F A134067 Binomial transform of (1, 5, 3, 5, 3, 5, ...).
%F A134067 From _Colin Barker_, Mar 13 2014: (Start)
%F A134067 a(n) = 2^(2+n) - 2 for n > 0.
%F A134067 a(n) = 3*a(n-1) - 2*a(n-2) for n > 0.
%F A134067 G.f.: -(2*x^2-3*x-1) / ((x-1)*(2*x-1)). (End)
%F A134067 E.g.f.: 2*exp(x)*(2*exp(x) - 1) - 1. - _Stefano Spezia_, May 07 2023
%e A134067 a(3) = 30 = sum of row 3 terms of triangle A134066: (2 + 12 + 12 + 4).
%e A134067 a(3) = 30 = (1, 3, 3, 1) dot (1, 5, 3, 5) = (1 + 15 + 9 + 5).
%t A134067 Join[{1}, LinearRecurrence[{3, -2}, {6, 14}, 50]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 23 2012 *)
%o A134067 (PARI) Vec(-(2*x^2-3*x-1)/((x-1)*(2*x-1)) + O(x^100)) \\ _Colin Barker_, Mar 13 2014
%Y A134067 Cf. A095121, A134066.
%K A134067 nonn,easy
%O A134067 0,2
%A A134067 _Gary W. Adamson_, Oct 06 2007