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 A002702 M3709 N1515 #27 Feb 28 2019 09:44:02 %S A002702 1,4,120,3024,151200,79200,1513512000,1513512000,51459408000, %T A002702 74662922880,18068427336960,133196739984000,1215553449093984000, %U A002702 173650492727712000,3357242859402432000,101013513093196704000,2043503369875369321920000 %N A002702 Coefficients for numerical differentiation. %D A002702 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002702 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002702 H. E. Salzer, <a href="https://doi.org/10.1002/sapm1943221115">Coefficients for numerical differentiation with central differences</a>, J. Math. Phys., 22 (1943), 115-135. %H A002702 H. E. Salzer, <a href="/A002457/a002457_2.pdf">Coefficients for numerical differentiation with central differences</a>, J. Math. Phys., 22 (1943), 115-135. [Annotated scanned copy] %H A002702 T. R. Van Oppolzer, <a href="http://www.archive.org/stream/lehrbuchzurbahnb02oppo#page/21/mode/1up">Lehrbuch zur Bahnbestimmung der Kometen und Planeten</a>, Vol. 2, Engelmann, Leipzig, 1880, p. 21 (see denominators of numbers named N(3,2k+1)). %F A002702 a(n) = den(6 * A002455(n) / 2^(2*n) * (2*n + 3)!). - _Sean A. Irvine_, Jun 10 2014 %Y A002702 Cf. A002455 (central factorial numbers), A002701 (numerators). %K A002702 nonn,frac %O A002702 2,2 %A A002702 _N. J. A. Sloane_ %E A002702 More terms from _Sean A. Irvine_, Jun 10 2014