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 A096463 #11 Sep 19 2017 12:33:07 %S A096463 1,2,7,219,226,32989,33215,165849,364913,3085153,3450066,23785549, %T A096463 27235615,78256779,262005952,340262731,1623056876,1963319607, %U A096463 11439654911,13402974518,560961610149,574364584667,1709690779483 %N A096463 Denominators of convergents to Pi/2. %H A096463 I. Rosenholtz, <a href="http://www.jstor.org/stable/2690793">Tangent sequences, world records, ...</a>, Math. Mag., 72 (No. 5, 1999), 367-376. %e A096463 1, 2, 3/2, 11/7, 344/219, 355/226, ... %Y A096463 Cf. A096456, A053300. %K A096463 nonn,frac,easy %O A096463 1,2 %A A096463 _N. J. A. Sloane_, Aug 16 2004 %E A096463 More terms from _Matthew Conroy_, Jan 16 2006