|
%I #37 Feb 26 2023 18:05:39
%S 1,16,1296,6912,6480000,2592000,6223392000,14224896000,1440270720000,
%T 320060160000,2811600481536000,511200087552000,255506749760021760000,
%U 291175783202304000,16846598885276160000
%N Denominators of poly-Cauchy numbers c_n^(4).
%C The poly-Cauchy numbers c_n^(k) can be expressed in terms of the (unsigned) Stirling numbers of the first kind: c_n^(k) = (-1)^n*sum(abs(stirling1(n,m))*(-1)^m/(m+1)^k, m=0..n).
%H Vincenzo Librandi, <a href="/A224098/b224098.txt">Table of n, a(n) for n = 0..300</a>
%H Takao Komatsu, <a href="http://www.kurims.kyoto-u.ac.jp/~kyodo/kokyuroku/contents/pdf/1806-06.pdf">Poly-Cauchy numbers</a>, RIMS Kokyuroku 1806 (2012)
%H Takao Komatsu, <a href="http://link.springer.com/article/10.1007/s11139-012-9452-0">Poly-Cauchy numbers with a q parameter</a>, Ramanujan J. 31 (2013), 353-371.
%H Takao Komatsu, <a href="http://doi.org/10.2206/kyushujm.67.143">Poly-Cauchy numbers</a>, Kyushu J. Math. 67 (2013), 143-153.
%H T. Komatsu, V. Laohakosol, K. Liptai, <a href="http://dx.doi.org/10.1155/2013/179841">A generalization of poly-Cauchy numbers and its properties</a>, Abstract and Applied Analysis, Volume 2013, Article ID 179841, 8 pages.
%H Takao Komatsu, FZ Zhao, <a href="http://arxiv.org/abs/1603.06725">The log-convexity of the poly-Cauchy numbers</a>, arXiv preprint arXiv:1603.06725, 2016
%t Table[Denominator[Sum[StirlingS1[n, k]/ (k + 1)^4, {k, 0, n}]], {n, 0, 25}]
%o (PARI) a(n) = denominator(sum(k=0, n,stirling(n, k, 1)/(k+1)^4)); \\ _Michel Marcus_, Nov 15 2015
%Y Cf. A006233, A222748, A224094, A224096, A224099 (numerators).
%K nonn,frac
%O 0,2
%A _Takao Komatsu_, Mar 31 2013
|
