[seqfan] Re: Offsets for Recurrence Sequences

[N. J. A. Sloane]

Creighton,   the OEIS policy is to start a sequence at the earliest
reasonable point, but no earlier

The Fibs could have begun 1 1 2 3 ... or 1 2 3 5 8 ..., but the
universally accepted version starts 0 1 1 2 3 5 8 ... and there are very
good reasons for this

(having to do with theorems that say that F(n) has
some property iff n has some other property

The situation with regard to the Lucas numbers is quite different.
There are good reasons for having them begin 1 3 4 7 ...
and also for 2 1 3 4 7 ... . Especially because the OEIS
is arranged lecicographically acc. to the first term > 1 in magnitude.

so whereas all the versions of the Fibs would appear in the same place in
the ordering, the Lucas numbers could appear in two different places.

Neil