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A026949 formatted as a simple table:

n a(n)
3 1
4 12
5 83
6 630
7 3171
8 21672
9 97482
10 639180
11 2730615
12 17543196
13 72932904
14 463291920
15 1895949055
16 11961944400
17 48478715240
18 304543085040

[1,12,83,630,3171,21672,97482,639180,2730615,
 17543196,72932904,463291920,1895949055,
 11961944400,48478715240,304543085040]

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


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