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A052890 formatted as a simple table:

n a(n)
0 1
1 1
2 2
3 6
4 16
5 49
6 153
7 493
8 1623
9 5460
10 18625
11 64373
12 224843
13 792546
14 2815443
15 10070115
16 36233440
17 131063713
18 476320360
19 1738401482
20 6368750019 

[1,1,2,6,16,49,153,493,1623,5460,18625,64373,
 224843,792546,2815443,10070115,36233440,131063713,
 476320360,1738401482,6368750019]

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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