[seqfan] Re: Bad pdf file in A002369?

M. F. Hasler oeis at hasler.fr
Sun Feb 25 00:25:19 CET 2018

On Sat, Feb 24, 2018 at 4:01 PM, Richard J. Mathar <mathar at mpia-hd.mpg.de>

> The construction of sequence A002369 is not clear to me either
> (probably because I don't understand the fine-tuned French).

The fine-tuned French says in particular, after the table of numbers,

*"Needless to say that the chances of errors are numerous in this kind of
*and we can only affirm the order of magnitude and not the exact figure*
*["digits of unity", literally]. Superfluous to add that we dont have the
general law."*

So IMHO there is non-negligible probability that this is just an erroneous
version of A056780.
Looking at the illustrations of initial terms shows that for n=4,
polyomino is in both, but the
polyomino is only in A056780.
OTOH, the fact that XX and
are counted as different in both, makes me think that the omission of the
second 4-polyomino above is not intended.

- Maximilian

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