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%I
%S -240,-164,-86,-11,66,141,218,295,374,451,530,607,684,760,837,912,989,
%T 1066,1145,1222,1301,1378,1456,1531,1607,1682,1759,1835,1910,1985
%N Years of recorded appearances of Halley's Comet (negative years are B.C.).
%C This sequence is not well-defined for many reasons (negative years are ill-defined; calendars change often, so when does a year begin?; what does "observed" mean?; what if the comet was observed both at the end of one year and at the beginning of another, as in 1985/1986?; etc.). - _N. J. A. Sloane_, Jun 24 2007
%H Joseph M. Laufer, <a href="http://www.lauferworld.com/haleyhome.html">Halley's Comet, Its 30th Recorded Return, 1985-1986</a>.
%e a(30) = 1985 because the 30th recorded appearance of Halley's comet was in 1985.
%Y See A072235 for another version.
%K sign
%O 1,1
%A _David Terr_, Jan 03 2005
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