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 A254706 #22 Sep 08 2022 08:46:11
%S A254706 0,2,2,2,10,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,32,33,
%T A254706 122,35,125,64,70,90,36,71,50,65,159,27,79,175,155,197,164,66,95,204,
%U A254706 156,223,191,156,140,184,231,32,208,35,224,83,193,143,234,1,273
%N A254706 a(n) = Catalan(2*n) mod prime(n).
%H A254706 Vincenzo Librandi, <a href="/A254706/b254706.txt">Table of n, a(n) for n = 1..10000</a>
%F A254706 a(n) = A000108(2n) mod A000040(n).
%t A254706 Table[Mod[CatalanNumber[2 n], Prime[n]], {n, 70}]
%o A254706 (Magma) [Catalan(2*n) mod NthPrime(n): n in [1..100]];
%Y A254706 Cf. A000040, A000108, A246714.
%K A254706 nonn
%O A254706 1,2
%A A254706 _Vincenzo Librandi_, Feb 06 2015