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A005559 formatted as a simple table:

n a(n)
1 1
2 2
3 8
4 20
5 75
6 210
7 784
8 2352
9 8820
10 27720
11 104544
12 339768
13 1288287
14 4294290
15 16359200
16 55621280
17 212751396
18 734959368
19 2821056160
20 9873696560
21 38013731756 

[1,2,8,20,75,210,784,2352,8820,27720,104544,
 339768,1288287,4294290,16359200,55621280,
 212751396,734959368,2821056160,9873696560,
 38013731756]

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Last modified December 10 12:09 EST 2009. Contains 170569 sequences.

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