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 A100647 #3 Mar 30 2012 16:50:06 %S A100647 1,16,25,34,2989,5248,1209,5675,560593,893128,11148172711,109420087, %T A100647 349259195,83221185536,17347403755459,161769065751,26070191142124243, %U A100647 4137435748625,1745702310941533,1389851895548897,936428641553074799449741,748157499921069376 %N A100647 Numerator of Cotesian number C(n,3). %D A100647 Charles Jordan, Calculus of Finite Differences, Chelsea 1965, p. 513. %e A100647 1/8, 16/45, 25/144, 34/105, 2989/17280, 5248/14175, 1209/5600, 5675/12474, 560593/1935360, 893128/1576575, 11148172711/28740096000, 109420087/156370500, ... = A100627/A100628 %Y A100647 See A002176 for further references. A diagonal of A100640/A100641. %K A100647 nonn,frac %O A100647 3,2 %A A100647 _N. J. A. Sloane_, Dec 05 2004