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 A129504 #5 Aug 09 2018 15:12:35
%S A129504 1,2,3,5,8,12,17,24,34,48,67,92,124,164,213,273,347,439,554,698,878,
%T A129504 1102,1379,1719,2133,2633,3232,3944,4784,5768,6913,8238,9765,11520,
%U A129504 13534,15844,18494,21536,25031,29050,33675,39000,45132,52192,60316,69656,80381
%N A129504 Row sums of triangle A129503.
%H A129504 Andrew Howroyd, <a href="/A129504/b129504.txt">Table of n, a(n) for n = 1..1000</a>
%F A129504 a(n) = Sum_{k >= 0, 2^k <= n} binomial(n - 2^k + k, k). - _Andrew Howroyd_, Aug 09 2018
%e A129504 a(7) = 17 = sum of row 7 terms of A129503: (1 + 6 + 0 + 10 + 0 + 0 + 0).
%o A129504 (PARI) a(n)=sum(k=0, logint(n, 2), binomial(n-2^k+k, k)) \\ _Andrew Howroyd_, Aug 09 2018
%Y A129504 Row sums of A129503 (Pascal Fredholm-Rueppel triangle).
%Y A129504 Cf. A129503.
%K A129504 nonn
%O A129504 1,2
%A A129504 _Gary W. Adamson_, Apr 18 2007
%E A129504 Offset and a(9) corrected and a(11)-a(47) from _Andrew Howroyd_, Aug 09 2018