[seqfan] Help with A002793 needed/Karol A. Penson

Karol PENSON penson at lptl.jussieu.fr
Mon Jul 5 19:02:09 CEST 2010

Can anyone help with the following three questions concerning A002793:

     1.  is the formula for a(n) known ?
     2.  is any generating function (ogf , egf ... etc. ) of a(n) known ?
     3.  in one of my calculations the following splitting of a(n)'s 
appear :

                   a(2)=4    =3+1
                   a(3)=20  =11+8+1
         I would be happy to obtain the formula for the triangle.

       Thanks in advance ,    Karol A. Penson

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