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 A152669 #13 Dec 01 2019 07:15:23 %S A152669 1,1,2,5,4,2,2,9,0,2,6,6,2,0,0,5,0,0,0,0,0,0,0,0,4,2,2,4,0,8,4,9,8,0, %T A152669 4,2,2,4,0,0,0,0,0,0,0,0,0,0,0,2,6,6,2,0,4,2,2,4,0,2,6,6,2,5,0,0,0,0, %U A152669 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A152669 Last digit of Catalan number A000108(n). %C A152669 Catalan numbers read modulo 10. - _Philippe Deléham_, Apr 28 2009 %H A152669 Amiram Eldar, <a href="/A152669/b152669.txt">Table of n, a(n) for n = 0..10000</a> %F A152669 a(n)= A000108(n) mod 10. - _Philippe Deléham_, Apr 28 2009 %t A152669 Mod[CatalanNumber[Range[0,100]],10] (* _Harvey P. Dale_, Apr 07 2015 *) %Y A152669 Cf. A000108. %K A152669 base,easy,nonn %O A152669 0,3 %A A152669 _Omar E. Pol_, Dec 10 2008