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 A293021 #4 Sep 29 2017 07:20:08
%S A293021 1,1,4,24,192,1880,21312,266504,3469312,42094656,297625600,
%T A293021 -8727514752,-659406274560,-31019532622208,-1314656227540992,
%U A293021 -54314985911216640,-2248955319931633664,-94369141109824233472,-4028982346754921594880,-175032005028072692797440
%N A293021 a(n) = n! * [x^n] exp(n*sin(x)).
%t A293021 Table[n! SeriesCoefficient[Exp[n Sin[x]], {x, 0, n}], {n, 0, 19}]
%Y A293021 Cf. A002017.
%K A293021 sign
%O A293021 0,3
%A A293021 _Ilya Gutkovskiy_, Sep 28 2017