[seqfan] Re: help needed for number of 2-covers
RGWv
rgwv at rgwv.com
Sun Jul 3 19:02:21 CEST 2011
Neil,
This works but if is not elegant.
f[n_] := FullSimplify[(n!/E)*Sum[(1/m!)*Sum[(-1/2)^k*Binomial[m*(m - 1)/2,
n - k]/k!, {k, 0, n}], {m, 0, Infinity}]]
Bob.
-----Original Message-----
From: N. J. A. Sloane
Sent: Sunday, July 03, 2011 11:46 AM
To: seqfan at list.seqfan.eu
Subject: [seqfan] Re: help needed for number of 2-covers
Robert, Thanks for this!
> That is A060053.
(used only m<1000 for small n values to get v_n for small n values).
I have now edited A060053 to add the new reference.
Unfortunately there is no Maple or Mma program for that entry!
And no b-file. Could you add either?
Neil
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