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 A100644 #3 Mar 30 2012 16:50:06 %S A100644 2,3,8,45,96,35,17280,14175,89600,149688,29030400,79625,402361344000, %T A100644 312741000,229605376,488462349375,83691159552000,50697046400, %U A100644 8604790260498432,1470076286679,29967718809600000,4694524604733600000,269760174666625843200000,5699209469078125 %N A100644 Denominator of Cotesian number C(n,1). %D A100644 Charles Jordan, Calculus of Finite Differences, Chelsea 1965, p. 513. %e A100644 1/2, 2/3, 3/8, 16/45, 25/96, 9/35, 3577/17280, 2944/14175, 15741/89600, 26575/149688, 4495513/29030400, 12504/79625, 56280729661/402361344000, 44436679/312741000, ... = A100623/A100624 = A002178/A002176 (the latter not being in lowest terms) %Y A100644 See A002176 for further references. A diagonal of A100640/A100641. %K A100644 nonn,frac %O A100644 1,1 %A A100644 _N. J. A. Sloane_, Dec 04 2004