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 A056997 #16 Jul 08 2016 03:40:54 %S A056997 30,30,30,30,30,30,30,30,30,30,30,30,5,30,30,30,30,30,30,30,30,30,30, %T A056997 30,30,5,30,30,30,30,30,30,30,30,30,30,30,30,5,30,30,30,30,30,30,30, %U A056997 30,30,30,30,30,6 %N A056997 Number of days in months of Ethiopic calendar. %C A056997 The twelve months of Maskaram, Tepemt, Khedar, Takhsas, Ter, Yakatit, Magabit, Miyazya, Genbot, Sane, Harnle and Nahase each have thirty days and the remaining days are in Paguemen. %C A056997 The intercalary month has 5 days on non-leap years, 6 days on leap years. Every fourth year is a leap year, with no exceptions. Thus, a(n) = a(n-52). - _Jon E. Schoenfield_, Feb 16 2015 %H A056997 A. Molla, <a href="http://www.ethiopic.com/calendar/ethiopic.htm">The Ethiopic Calendar</a> %H A056997 PandaWave Company, <a href="http://web.archive.org/web/20001214020300/http://www.pandawave.com/wcinfo.html">World Calendars</a> [archived link] %H A056997 E. G. Richards, <a href="https://muse.jhu.edu/article/18472">Mapping Time, The Calendar and its History</a>, Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, Reprinted 1999 (with corrections) page 231-5, 290, 311, 321. %H A056997 Wikipedia, <a href="http://en.wikipedia.org/wiki/Ethiopian_calendar">Ethiopian Calendar</a> %Y A056997 Cf. A056958. %K A056997 nonn %O A056997 1,1 %A A056997 _Robert G. Wilson v_, Sep 06 2000 %E A056997 As _Antti Karttunen_ points out, this cannot be right as there are 15 or 16 30's between pairs of 5's, not 11. - _N. J. A. Sloane_, Aug 25 2002 %E A056997 Marked one link as broken. Added two links and cf. to the Coptic Calendar. - _R. J. Mathar_, Oct 13 2008