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A084901 as a simple table

n a(n)
0 0
1 1
2 13
3 108
4 736
5 4480
6 25344
7 136192
8 704512
9 3538944
10 17367040
11 83623936
12 396361728
13 1853882368
14 8573157376
15 39258685440
16 178241142784
17 803158884352
18 3594887626752
19 15994458210304
20 70781061038080
21 311711546474496

[0,1,13,108,736,4480,25344,136192,704512,3538944,
 17367040,83623936,396361728,1853882368,8573157376,
 39258685440,178241142784,803158884352,
 3594887626752,15994458210304,70781061038080,
 311711546474496]

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Last modified May 19 12:53 EDT 2013. Contains 225429 sequences.