[seqfan] Re: Currency puzzle

Joerg Arndt arndt at jjj.de
Sun Sep 27 10:11:45 CEST 2015


About 
> G.F.: (1+x)(1+2x^2)(1+x^3)(1+2x^4)(1+2x^8)(1+2x^16)(1+2x^32)(1+2x^64)
versus
  G.F.: (1+x)(1+x^2)^2(1+x^3)(1+x^4)^2(1+x^8)^2(1+x^16)^2(1+x^32)^2(1+x^64)^2

The first accounts for ordered sorts, the second for un-ordered
which is more common with partitions.  "Ordered" is more common
with compositions ("ordered partitions").

Regards,  jj


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