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A113845
a(1) =a(2) =1. a(n+1) = (product{1<=k<=n/2} a(k)) + (product{n/2<j<=n} a(j)).
+0
1
1, 1, 2, 3, 7, 43, 905, 817217, 222613996891, 49556991610450473684541, 350842202496894090472936261713260177362896247, 12309025105287163797152809607718355345751135122592246827855872312265215391047767\ 4845042677
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Maintained by
N. J. A. Sloane
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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