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 A028357 #13 Jul 08 2025 18:32:20 %S A028357 1,3,6,10,13,15,16,18,21,25,28,30,31,33,36,40,43,45,46,48,51,55,58,60, %T A028357 61,63,66,70,73,75,76,78,81,85,88,90,91,93,96,100,103,105,106,108,111, %U A028357 115,118,120,121,123,126 %N A028357 Partial sums of A028356. %H A028357 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,-1,2,-1). %F A028357 G.f.: ( 1+x+2*x^3+x^2 ) / ( (1+x)*(x^2-x+1)*(x-1)^2 ). - _R. J. Mathar_, Dec 15 2015 %Y A028357 Cf. A047401. - _Jeremy Gardiner_, Jul 20 2013. %K A028357 nonn,easy %O A028357 0,2 %A A028357 _N. J. A. Sloane_