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A137273 formatted as a simple table:

n a(n)
1 1
2 1
3 2
4 3
5 6
6 13
7 37
8 134
9 659
10 4416
11 41343
12 546577
13 10345970
14 283128770
15 11306821624
16 664047579721
17 57753201767477
18 7483309752358051 

[1,1,2,3,6,13,37,134,659,4416,41343,546577,
 10345970,283128770,11306821624,664047579721,
 57753201767477,7483309752358051]

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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