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 A014783 #9 Jul 08 2025 05:41:55 %S A014783 1,3,3,17,25,17,155,259,259,155,2073,3681,4289,3681,2073,38227,70235, %T A014783 88507,88507,70235,38227,929569,1744457,2302121,2500393,2302121, %U A014783 1744457,929569,28820619,54852531,74568595,85191699,85191699,74568595 %N A014783 Triangle of numbers associated with Genocchi numbers. %H A014783 G. Kreweras, <a href="https://doi.org/10.1006/eujc.1995.0081">Sur les permutations comptées par les nombres de Genocchi de 1-ière et 2-ième espèce</a>, Europ. J. Comb., vol. 18, pp. 49-58, 1997. %K A014783 tabl,nonn %O A014783 1,2 %A A014783 _N. J. A. Sloane_ %E A014783 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 22 2003