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A006815 formatted as a simple table:

n a(n)
1 1
2 6
3 23
4 84
5 283
6 930
7 2921
8 9096
9 27507
10 82930
11 244819
12 722116
13 2096603
14 6087290
15 17458887
16 50090544
17 142317089
18 404543142 

[1,6,23,84,283,930,2921,9096,27507,82930,244819,
 722116,2096603,6087290,17458887,50090544,
 142317089,404543142]

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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