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A137975 formatted as a simple table:

n a(n)
0 1
1 2
2 8
3 32
4 167
5 928
6 5924
7 40211
8 293370
9 2255406
10 18201706
11 153141115
12 1339341815
13 12124729941
14 113363309476
15 1092332531380 

[1,2,8,32,167,928,5924,40211,293370,2255406,
 18201706,153141115,1339341815,12124729941,
 113363309476,1092332531380]

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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