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 A328885 #13 Oct 30 2019 03:45:31 %S A328885 1,8,45,416,1685,31032,229026,13856896,132843888,6551143600, %T A328885 672567897859,346984064352,51233511973865,99704578224832, %U A328885 1521740934249300,87595020192056292864,81891555365769626429,12883000343953567644,318718123756704667891346,50107182570391966040000,500792393469899639083500 %N A328885 Improved version of A002686; secondary main diagonal of A324124. %C A328885 Sequence A002686 has only 10 terms (from n = 1 to n = 10). We have a(n) = A002686(n) for 1 <= n <= 10 except for n = 7: a(7) = 229026 while A002686(7) = 1603182 (which is a(7) * 7 = 229026 * 7). For an explanation, see the comments for array A324124. This is necessary to give a unique definition to the terms of array A324124. %H A328885 Petros Hadjicostas, <a href="/A328885/a328885.txt">Maple program</a>. %H A328885 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 A328885 Cf. A002685, A002686, A324124, A328866, A328884. %K A328885 nonn %O A328885 1,2 %A A328885 _Petros Hadjicostas_, Oct 29 2019