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 A011771 #12 Jun 26 2013 10:58:32 %S A011771 36525,36525,36525,36525,36525,36525,36525,36525,36525,36525,36525, %T A011771 36525,36525,36525,36525,36515,36524,36524,36524,36525,36524,36524, %U A011771 36524,36525,36524,36524,36524,36525,36524,36524,36524,36525,36524 %N A011771 Days per century for Roman calendar from first century, following Gregorian calendar after A.D. 1582. %H A011771 Wikipedia, <a href="http://en.wikipedia.org/wiki/Gregorian_calendar#Adoption_in_Europe">Gregorian calendar</a> %H A011771 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a> %Y A011771 Compare with A011770. %K A011771 nonn %O A011771 1,1 %A A011771 jclerm(AT)aztec.asu.edu (DR. JUAN-CARLOS LERMAN) %E A011771 Definition corrected by _Michel Marcus_, Jun 26 2013