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 A293716 #12 Oct 16 2017 19:54:57
%S A293716 1,1,5,31,145,1181,9661,77155,794081,8132185,86715541,1055208551,
%T A293716 12921555505,166589628661,2320023320525,32814550442731,
%U A293716 486870347843521,7598251948512305,121035455085677221,2008950533339620015,34595064617371963601,609252363677557660621
%N A293716 E.g.f.: exp(x + 2*x^2 + 3*x^3).
%H A293716 Seiichi Manyama, <a href="/A293716/b293716.txt">Table of n, a(n) for n = 0..533</a>
%F A293716 a(n) ~ 3^(2*n/3 - 1/2) * n^(2*n/3) * exp(-76/729 + 19*3^(1/3)*n^(1/3)/81 + 2*3^(2/3)*n^(2/3)/9 - 2*n/3). - _Vaclav Kotesovec_, Oct 15 2017
%t A293716 CoefficientList[Series[E^(x+2*x^2+3*x^3), {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Oct 15 2017 *)
%o A293716 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp(x+2*x^2+3*x^3)))
%Y A293716 Column k=3 of A293718.
%K A293716 nonn
%O A293716 0,3
%A A293716 _Seiichi Manyama_, Oct 15 2017