[seqfan] Sequences that use '-1' to indicate 'impossible'.

Sidney Cadot sidney at jigsaw.nl
Wed Sep 23 14:12:42 CEST 2015


Some sequences use '-1' to indicate that a certain entry does not
exist, e.g. A154852 and A237584.

Should such sequences be considered signed (kw:sign) or unsigned (kw:nonn)?

Wouldn't it be more appropriate to allow an explicit "null" value in such cases?

Regards, SIdney

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