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 A293723 #11 Feb 04 2019 12:24:52
%S A293723 1,1,9,79,841,7821,118681,1782019,28600209,490277881,9841912201,
%T A293723 200678086071,4335000908569,100095347642629,2477069706227481,
%U A293723 63039923265570091,1685240267891749921,47330265699309738609,1386300580285054314889
%N A293723 E.g.f.: exp(x + 4*x^2 + 9*x^3 + 16*x^4).
%H A293723 Seiichi Manyama, <a href="/A293723/b293723.txt">Table of n, a(n) for n = 0..461</a>
%t A293723 With[{nn=20},CoefficientList[Series[Exp[x+4x^2+9x^3+16x^4],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Feb 04 2019 *)
%o A293723 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp(x+4*x^2+9*x^3+16*x^4)))
%Y A293723 Column k=4 of A293724.
%K A293723 nonn
%O A293723 0,3
%A A293723 _Seiichi Manyama_, Oct 15 2017