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A004040 formatted as a simple table:

n a(n)
0 1
1 2
2 6
3 23
4 103
5 512
6 2740
7 15485
8 91245
9 555662
10 3475090
11 22214707
12 144640291
13 956560748
14 6411521056
15 43478151737
16 297864793993 

[1,2,6,23,103,512,2740,15485,91245,555662,3475090,
 22214707,144640291,956560748,6411521056,
 43478151737,297864793993]

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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