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 A192381 #4 Mar 30 2012 18:57:34 %S A192381 0,1,2,10,30,115,388,1396,4860,17205,60390,212894,748858,2637095, %T A192381 9281160,32674280,115012472,404871209,1425187530,5016903090, %U A192381 17660176470,62166525211,218835115532,770332126300,2711681718900,9545519439325,33601629823918 %N A192381 (A192380)/2. %C A192381 (See A192380.) %e A192381 (See A192380.) %t A192381 (See A192379.) %Y A192381 Cf. A192232, A192379, A192380. %K A192381 nonn %O A192381 1,3 %A A192381 _Clark Kimberling_, Jun 29 2011