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 A002686 M4533 N1922 #29 Oct 30 2019 03:42:48 %S A002686 1,8,45,416,1685,31032,1603182,13856896,132843888,6551143600 %N A002686 Coefficients for numerical integration. %C A002686 From _Petros Hadjicostas_, Oct 29 2019: (Start) %C A002686 This is the secondary main diagonal of A324124 (which is essentially Table I on p. 217 in Luke (1952)), except that a(7) = 1603182 must be replaced with 1603182/7 = 229026. This is necessary to give a unique definition to the terms of A324124. For more information, see the comments for A324124. %C A002686 Luke (1952) is not wrong (since 1603182/4054050 = 229026/579150), but his integers for the case n = 7 have to modified as mentioned in the documentation of array A324124. For an improved version of this sequence, see A328885. (End) %D A002686 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002686 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002686 Yudell L. Luke, <a href="https://doi.org/10.1090/S0025-5718-1952-0050993-8">Mechanical quadrature near a singularity</a>, Math. Comp. 6 (1952), 215-219. %Y A002686 Cf. A002685, A328866, A328884, A328885. %Y A002686 Secondary diagonal of A324124 (except for a(7)). %K A002686 nonn %O A002686 1,2 %A A002686 _N. J. A. Sloane_