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 A160613 #9 Sep 08 2022 08:45:45
%S A160613 1,4,23,28,491,1249,19223,15476,3515161,1512661,14496817,228800107,
%T A160613 11770539419,60428965661,5262254717509,2521163372543,976843770850217,
%U A160613 887131806309703,73511154681979031,255777165814872577
%N A160613 Numerator of Laguerre(n, -3).
%H A160613 G. C. Greubel, <a href="/A160613/b160613.txt">Table of n, a(n) for n = 0..480</a>
%t A160613 Numerator[Table[LaguerreL[n, -3], {n, 0, 50}]] (* _G. C. Greubel_, May 09 2018 *)
%o A160613 (PARI) for(n=0,30, print1(numerator(sum(k=0,n, binomial(n,k)*(3^k/k!))), ", ")) \\ _G. C. Greubel_, May 09 2018
%o A160613 (Magma) [Numerator((&+[Binomial(n,k)*(3^k/Factorial(k)): k in [0..n]])): n in [0..30]]; // _G. C. Greubel_, May 09 2018
%Y A160613 For denominators see A160614.
%Y A160613 Cf. A277382.
%K A160613 nonn,frac
%O A160613 0,2
%A A160613 _N. J. A. Sloane_, Nov 14 2009