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A146664 formatted as a simple table:

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 3
8 19
9 43
10 87
11 303
12 1077
13 3757
14 15681
15 80673
16 475263
17 2975253
18 20229343
19 160250909
20 1366441107
21 13345035623 

[1,1,1,1,1,1,3,19,43,87,303,1077,3757,15681,80673,
 475263,2975253,20229343,160250909,1366441107,
 13345035623]

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

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