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A126757 formatted as a simple table:

n a(n)
1 1
2 1
3 1
4 2
5 4
6 8
7 18
8 47
9 137
10 464
11 1793
12 8167
13 43645
14 275480
15 2045279
16 17772647
17 179593823
18 2098423758
19 28215583324 

[1,1,1,2,4,8,18,47,137,464,1793,8167,43645,275480,
 2045279,17772647,179593823,2098423758,
 28215583324]

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

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