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 A030813 #10 Mar 16 2020 02:30:42 %S A030813 2,4,12,48,240,1443,10105,80842,727580,7275803,80033833,960405999, %T A030813 12485277998,174793891980,2621908379701,41950534075224, %U A030813 713159079278809,12836863427018578,243900405113352992,4878008102267059852 %N A030813 a(n) = floor(exp(16/23) * n!). %e A030813 16/23 = 0.69565217391304347826... %e A030813 e^(16/23) = 2.00501626694078250734215635836..., so a(1) = 2. %e A030813 e^(16/23) * 2! = 4.01003253388156501468431271672..., so a(2) = 4. %e A030813 e^(16/23) * 3! = 12.03009760164469504405293815..., so a(3) = 12. %t A030813 Floor[E^(16/23) Range[20]!] (* _Alonso del Arte_, Mar 16 2020 *) %Y A030813 Cf. A021027 (1/23). %K A030813 nonn,easy %O A030813 1,1 %A A030813 _Simon Plouffe_