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A001315 formatted as a simple table:

n a(n)
0 2
1 4
2 8
3 20
4 100
5 2116
6 1114244
7 68723671300
8 1180735735906024030724
9 170141183460507917357914971986913657860 

[2,4,8,20,100,2116,1114244,68723671300,
 1180735735906024030724,
 170141183460507917357914971986913657860]

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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