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PROD((a(k)+1): k>0) = A174601(26). [From Reinhard Zumkeller, Apr 02 2010]
Table of n, a(n) for n=1..98.
Cf. A003131, A001379, A002267.
Sequence in context: A055766 A261513 A036204 * A260512 A033366 A097927
Adjacent sequences: A051158 A051159 A051160 * A051162 A051163 A051164
N. J. A. Sloane.
a(n)=0 for n>20.