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 A328885 Improved version of A002686; secondary main diagonal of A324124. 6

%I

%S 1,8,45,416,1685,31032,229026,13856896,132843888,6551143600,

%T 672567897859,346984064352,51233511973865,99704578224832,

%U 1521740934249300,87595020192056292864,81891555365769626429,12883000343953567644,318718123756704667891346,50107182570391966040000,500792393469899639083500

%N Improved version of A002686; secondary main diagonal of A324124.

%C 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 Petros Hadjicostas, <a href="/A328885/a328885.txt">Maple program</a>.

%H 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 Cf. A002685, A002686, A324124, A328866, A328884.

%K nonn

%O 1,2

%A _Petros Hadjicostas_, Oct 29 2019

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Last modified September 18 10:31 EDT 2020. Contains 337166 sequences. (Running on oeis4.)