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 A164849 #7 Feb 02 2023 08:37:04 %S A164849 1,1,101,102,10103,10205,1010308,1020513,101030821,102051334, %T A164849 10103082155,10205133489,1010308215644,1020513349133,101030821564777, %U A164849 102051334913910,10103082156478687,10205133491392597,1010308215647871284,1020513349139263881,101030821564787135165,102051334913926399046 %N A164849 Diagonal sum of (100^n,1) Pascal triangle. %H A164849 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (1,101,-100,-100) %F A164849 G.f.: -x*(x-1)*(1+x) / ( (10*x+1)*(10*x-1)*(x^2+x-1) ). - _R. J. Mathar_, Nov 03 2016 %o A164849 (PARI) Vec(-x*(x-1)*(1+x) / ( (10*x+1)*(10*x-1)*(x^2+x-1) ) + O(x^25)) \\ _Michel Marcus_, Feb 02 2023 %Y A164849 Cf. A164847. %K A164849 nonn,easy %O A164849 1,3 %A A164849 _Mark Dols_, Aug 28 2009 %E A164849 More terms from _Michel Marcus_, Feb 02 2023