[seqfan] Question on A001761

Karol A. Penson penson at lptmc.jussieu.fr
Wed Feb 22 18:19:58 CET 2012

Dear Seqfans, does anyone know the demonstration, proof or a reference 
which explains that
                       A001761(n)=(2*n)!/(n+1)! counts *the number of 
dissections of the disk* (this is
                       the first line of Comments on this sequence) ?

                        Thanking in advance,

                               Karol A. Penson

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