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These numbers are not well-defined and the sequence is included only for completeness.
For magnitude -1, the number includes any star whose magnitude is between -1.50 and -0.51, of which there are only two, Sirius and Canopus.
Table of n, a(n) for n=-1..20.
David Haworth, How Many Stars You Can Observe
Sequence in context: A188491 A192764 A055691 * A131518 A222201 A130642
Adjacent sequences: A072168 A072169 A072170 * A072172 A072173 A072174
Robert G. Wilson v, Jun 28 2002
Corrected a(5) to agree with the table at the Haworth link and edited the Comments.