[seqfan] Re: definition of A002848

Rainer Rosenthal r.rosenthal at web.de
Tue Feb 9 03:31:13 CET 2010


Max Alekseyev wrote:
> Does anybody understand the definition of A002848 and how it produces
> the listed terms?

No, I don't.
If we take e.g. n=5 then from the definition

     Number of solutions of x+y=z from {1,2,...,n}

I would count these as solutions:
1+2=3
1+3=4
1+4=5
2+3=5

This would give me a(5)=4.
The listed term is a(5)=2.

Cheerious,
Rainer





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