[seqfan] Re: A173279 and A173280

Klaus Brockhaus klaus-brockhaus at t-online.de
Mon Feb 22 22:24:46 CET 2010

Richard Mathar schrieb:
> kb> Does that suffice? What about 
> kb> 
> kb> %N A173317 a(n)=5*n!-1
> kb> %F A173317 a(n)=5*n!-1
> [.....]
> Here, this sort of repetition makes sense to verify that the exclamation
> mark in the definition is not an emphatic n but a factorial:
> %N A173317 5*n!-1.
> %F A173317 a(n) = 5*A000142(n)-1.
Although rather incredible notational aberrations can be found in some
OEIS entries - an emphatic exclamation mark in the context of
a multiplication star and a minus dash goes probably far beyond that.

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