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 A020123 #14 Nov 24 2022 14:21:38
%S A020123 1,1,1,1,3,12,63,393,2863,23715,220205,2264966,25561752,314044379,
%T A020123 4172303890,59604341273,911094930877,14837831731420,256482519928832,
%U A020123 4689966078698629,90449345803473559,1834829586299035049
%N A020123 Ceiling of Gamma(n+2/7)/Gamma(2/7).
%H A020123 Robert Israel, <a href="/A020123/b020123.txt">Table of n, a(n) for n = 0..450</a>
%F A020123 a(n) ~ sqrt(2*Pi)*n^(n-3/14)*exp(-n)/Gamma(2/7). - _Robert Israel_, Jan 02 2017
%p A020123 Digits := 64:f := proc(n,x) ceil(GAMMA(n+x)/GAMMA(x)); end;
%t A020123 Table[Ceiling[Gamma[n+2/7]/Gamma[2/7]],{n,0,30}] (* _Harvey P. Dale_, Nov 24 2022 *)
%Y A020123 Cf. A220605.
%K A020123 nonn
%O A020123 0,5
%A A020123 _Simon Plouffe_