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A000239 formatted as a simple table:

n a(n)
2 1
3 3
4 8
5 28
6 143
7 933
8 7150
9 62310
10 607445
11 6545935
12 77232740
13 989893248
14 13692587323
15 203271723033
16 3223180454138 

[1,3,8,28,143,933,7150,62310,607445,6545935,
 77232740,989893248,13692587323,203271723033,
 3223180454138]

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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