A020121 - OEIS

%I #15 Jan 15 2026 07:43:48

%S 1,1,1,3,9,38,211,1381,10451,89575,857352,9063435,104876888,

%T 1318452296,17893281148,260730668151,4059948975491,67279154450986,

%U 1182190856781604,21954973054515490,429690186924088871,8839340988152685339,190677212744436498025,4303857087660138098279

%N Ceiling of Gamma(n+4/7)/Gamma(4/7).

%H Paolo Xausa, <a href="/A020121/b020121.txt">Table of n, a(n) for n = 0..400</a>

%p Digits := 64:f := proc(n,x) ceil(GAMMA(n+x)/GAMMA(x)); end;

%t Ceiling[Pochhammer[4/7, Range[0, 25]]] (* _Paolo Xausa_, Jan 15 2026 *)

%Y Cf. A020031, A020076, A220609.

%K nonn

%O 0,4

%A _Simon Plouffe_

%E More terms from _Paolo Xausa_, Jan 15 2026