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A002840 formatted as a simple table:

n a(n)
6 1
7 0
8 1
9 2
10 2
11 4
12 12
13 22
14 58
15 158
16 448
17 1342
18 4199
19 13384
20 43708
21 144810
22 485704
23 1645576
24 5623571
25 19358410
26 67078828
27 233800162
28 819267086
29 2884908430

[1,0,1,2,2,4,12,22,58,158,448,1342,4199,13384,
 43708,144810,485704,1645576,5623571,19358410,
 67078828,233800162,819267086,2884908430]

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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