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 A323993 #9 Feb 14 2019 22:07:34
%S A323993 1,5,23,227,631
%N A323993 Numerators of central difference coefficients M_{5}^(2n+1).
%C A323993 Salzer's table extends to M_{5}^(29).
%H A323993 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 A323993 H. E. Salzer, <a href="/A002673/a002673.png">Annotated scanned copy of left side of Table I</a>.
%Y A323993 Cf. 1/A002671, A002673/A002672, A323994 (denominators).
%K A323993 nonn,frac,more
%O A323993 2,2
%A A323993 _N. J. A. Sloane_, Feb 14 2019