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 A200379 #13 Jul 13 2013 12:04:19 %S A200379 2,6,17,47,121,291,665,1467,3162,6718,14156,29702,62190,130060,271760, %T A200379 567488,1184917,2475907,5181798,10869647,22858188,48178441,101712259, %U A200379 214900119,454006064,958316150,2019797853,4248758319,8917387482,18670242203,38989676130 %N A200379 Second row of array defined in A056230. %C A200379 First differences of A057153; %C A200379 a(n) = A056230(n+1,n). %H A200379 Reinhard Zumkeller, <a href="/A200379/b200379.txt">Table of n, a(n) for n = 1..150</a> %o A200379 (Haskell) %o A200379 a200379 n = a056230_tabl !! n !! (n-1) %K A200379 nonn %O A200379 1,1 %A A200379 _Reinhard Zumkeller_, Nov 19 2011