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 A100651 #3 Mar 30 2012 16:50:06
%S A100651 1,1,1,1,3,3,29,29,17,17,193,193,-123,-123,-2687,-2687,-202863,
%T A100651 -202863,-307072861,-307072861,-34827193,-34827193,-13759888463,
%U A100651 -13759888463,-90168938889,-90168938889,-2200335979411,-2200335979411,-807090394867857,-807090394867857,-63216464619997641151
%N A100651 Numerator of 1 - Sum_{i=1..n} |Bernoulli(i)|.
%e A100651 1, 1/2, 1/3, 1/3, 3/10, 3/10, 29/105, 29/105, 17/70, 17/70, 193/1155, 193/1155, -123/1430, -123/1430, -2687/2145, -2687/2145, -202863/24310, -202863/24310, -307072861/4849845, ... = A100651/A100652.
%K A100651 sign
%O A100651 1,5
%A A100651 _N. J. A. Sloane_, Dec 05 2004