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 A323997 #4 Feb 14 2019 22:41:37
%S A323997 1,1,7,4,13,31,63047,1069
%N A323997 Numerators of coefficients for central differences M_{5}'^(2*n+1).
%H A323997 H. E. Salzer, <a href="https://doi.org/10.1002/sapm1963421162">Tables of coefficients for obtaining central differences from the derivatives</a>, Journal of Mathematics and Physics (this journal is also called Studies in Applied Mathematics), 42 (1963), 162-165, plus several inserted tables.
%H A323997 H. E. Salzer, <a href="/A002677/a002677.png">Annotated scanned copy of left side of Table III</a>
%Y A323997 Denominators are A323998.
%K A323997 nonn,frac,more
%O A323997 2,3
%A A323997 _N. J. A. Sloane_, Feb 14 2019