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A129815 as a simple table

n a(n)
1 0
2 0
3 1
4 2
5 6
6 22
7 102
8 506
9 2952
10 18502
11 131112
12 991226
13 8271792
14 73176262
15 703077552
16 7121578106
17 77437418112
18 883521487942
19 10726837356672
20 136104948161786

[0,0,1,2,6,22,102,506,2952,18502,131112,991226,
 8271792,73176262,703077552,7121578106,77437418112,
 883521487942,10726837356672,136104948161786]

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Last modified June 19 09:47 EDT 2013. Contains 226401 sequences.