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 A160614 #9 Sep 08 2022 08:45:45
%S A160614 1,1,2,1,8,10,80,35,4480,1120,6400,61600,1971200,6406400,358758400,
%T A160614 112112000,28700672000,17425408000,975822848000,2317579264000,
%U A160614 370812682240000,49917091840000,57105153064960000,41044328765440000
%N A160614 Denominator of Laguerre(n, -3).
%H A160614 G. C. Greubel, <a href="/A160614/b160614.txt">Table of n, a(n) for n = 0..499</a>
%t A160614 Denominator[Table[LaguerreL[n, -3], {n, 0, 50}]] (* _G. C. Greubel_, May 06 2018 *)
%o A160614 (PARI) for(n=0,30, print1(denominator(sum(k=0,n, binomial(n,k)*(3^k/k!))), ", ")) \\ _G. C. Greubel_, May 06 2018
%o A160614 (Magma) [Denominator((&+[Binomial(n,k)*(3^k/Factorial(k)): k in [0..n]])): n in [0..30]]; // _G. C. Greubel_, May 06 2018
%Y A160614 For numerators see A160613.
%Y A160614 Cf. A277382.
%K A160614 nonn,frac
%O A160614 0,3
%A A160614 _N. J. A. Sloane_, Nov 14 2009