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A328884 Improved version of A002685; main diagonal of A324124. 6
1, 2, 6, 34, 250, 972, 15498, 109544, 5961306, 54891535, 2488870076, 246264587430, 118503860254, 16917328320424, 31020551370600, 459016311081816, 25084010473396186126, 22789919291848918932, 3423598216929042597, 82480361346228654485320, 12440086312584102532500, 121292379506812780007192 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Sequence A002685 has only 10 terms (from n = 1 to n = 10). We have a(n) = A002685(n) for 1 <= n <= 10 except for n = 7: a(7) = 109544 while A002685(7) = 766808 (which is a(7) * 7 = 109544 * 7). For an explanation, see the comments for array A324124. This is necessary to give a unique definition to the terms of array A324124.

LINKS

Table of n, a(n) for n=0..21.

Petros Hadjicostas, Maple program.

Yudell L. Luke, Mechanical quadrature near a singularity, Math. Comp. 6 (1952), 215-219.

CROSSREFS

Cf. A002685, A002686, A324124, A328866, A328885.

Sequence in context: A019029 A019032 A108424 * A002685 A262391 A271212

Adjacent sequences:  A328881 A328882 A328883 * A328885 A328886 A328887

KEYWORD

nonn

AUTHOR

Petros Hadjicostas, Oct 29 2019

STATUS

approved

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