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A104631 formatted as a simple table:

n a(n)
0 0
1 1
2 4
3 18
4 80
5 365
6 1686
7 7875
8 37080
9 175725
10 837100
11 4004770
12 19227924
13 92599533
14 447118140
15 2163837030
16 10492874384
17 50972030189
18 248000853348
19 1208335275170
20 5894873067200
21 28791371852145
22 140768761906190

[0,1,4,18,80,365,1686,7875,37080,175725,837100,
 4004770,19227924,92599533,447118140,2163837030,
 10492874384,50972030189,248000853348,
 1208335275170,5894873067200,28791371852145,
 140768761906190]

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Last modified December 6 11:04 EST 2009. Contains 170427 sequences.


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