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 A192070 #4 Mar 30 2012 18:57:33 %S A192070 0,1,4,24,129,759,4455,26763,161898,988438,6069228,37460952,232160184, %T A192070 1443830084,9005809184,56316652784,352949825249,2216334391919, %U A192070 13941409199519,87830683173419,554096566907069,3499981913717189,22132830286939649 %N A192070 (A192251)/2. %C A192070 See A192232, A192251. %t A192070 (See A192250.) %Y A192070 Cf. A192232, A192251. %K A192070 nonn %O A192070 1,3 %A A192070 _Clark Kimberling_, Jun 27 2011