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 A160618 #13 Sep 08 2022 08:45:45
%S A160618 1,1,2,3,24,60,720,2520,40320,25920,3628800,19958400,479001600,
%T A160618 3113510400,87178291200,59439744000,426995712000,177843714048000,
%U A160618 582033973248000,60822550204416000,143111882833920000
%N A160618 Denominator of Laguerre(n, -1).
%H A160618 G. C. Greubel, <a href="/A160618/b160618.txt">Table of n, a(n) for n = 0..449</a>
%t A160618 Denominator[Table[LaguerreL[n, -1], {n, 0, 50}]] (* _G. C. Greubel_, May 06 2018 *)
%o A160618 (PARI) lista(nn) = {x = 'x + O('x^nn); v = exp(x/(1-x))/(1-x); for (n=0, nn-1, print1(denominator(polcoeff(v, n)), ", "););} \\ _Michel Marcus_, Nov 27 2015
%o A160618 (PARI) for(n=0,30, print1(denominator(sum(k=0,n, binomial(n,k)*(1/k!))), ", ")) \\ _G. C. Greubel_, May 06 2018
%o A160618 (Magma) [Denominator((&+[Binomial(n,k)*(1/Factorial(k)): k in [0..n]])): n in [0..30]]; // _G. C. Greubel_, May 06 2018
%Y A160618 For numerators see A160617.
%Y A160618 Cf. A002720.
%K A160618 nonn,frac
%O A160618 0,3
%A A160618 _N. J. A. Sloane_, Nov 14 2009