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 A323996 #7 Feb 14 2019 22:25:26
%S A323996 1,4,240,945,120960,7603200,523069747200,373621248000
%N A323996 Denominators of coefficients for central differences M_{6}^(2*n).
%C A323996 Salzer's table extends to M_{6}^(30).
%H A323996 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 A323996 H. E. Salzer, <a href="/A002675/a002675.png">Annotated scanned copy of left side of Table II</a>.
%Y A323996 Cf. A323995 (numerators).
%K A323996 nonn,frac,more
%O A323996 3,2
%A A323996 _N. J. A. Sloane_, Feb 14 2019