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A007081 formatted as a simple table:

n a(n)
1 1
2 1
3 3
4 15
5 219
6 7839
7 777069
8 208836207
9 156458382975
10 328208016021561
11 1946879656265710431
12 32834193098697741359313 

[1,1,3,15,219,7839,777069,208836207,156458382975,
 328208016021561,1946879656265710431,
 32834193098697741359313]

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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