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A026577 formatted as a simple table:

n a(n)
1 1
2 2
3 8
4 34
5 121
6 606
7 2155
8 11306
9 40717
10 217666
11 792351
12 4280046
13 15703156
14 85410872
15 315180458
16 1722900242
17 6385672193
18 35040356022 

[1,2,8,34,121,606,2155,11306,40717,217666,792351,
 4280046,15703156,85410872,315180458,1722900242,
 6385672193,35040356022]

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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