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A005809 formatted as a simple table:

n a(n)
0 1
1 3
2 15
3 84
4 495
5 3003
6 18564
7 116280
8 735471
9 4686825
10 30045015
11 193536720
12 1251677700
13 8122425444
14 52860229080
15 344867425584
16 2254848913647
17 14771069086725
18 96926348578605
19 636983969321700
20 4191844505805495
21 27619435402363035

[1,3,15,84,495,3003,18564,116280,735471,4686825,
 30045015,193536720,1251677700,8122425444,
 52860229080,344867425584,2254848913647,
 14771069086725,96926348578605,636983969321700,
 4191844505805495,27619435402363035]

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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