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A006632 as a simple table

n a(n)
1 1
2 3
3 15
4 91
5 612
6 4389
7 32890
8 254475
9 2017356
10 16301164
11 133767543
12 1111731933
13 9338434700
14 79155435870
15 676196049060
16 5815796869995
17 50318860986108
18 437662920058980
19 3824609516638444
20 33563127932394060
21 295655735395397520
22 2613391671568320765

[1,3,15,91,612,4389,32890,254475,2017356,16301164,
 133767543,1111731933,9338434700,79155435870,
 676196049060,5815796869995,50318860986108,
 437662920058980,3824609516638444,
 33563127932394060,295655735395397520,
 2613391671568320765]

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Last modified April 11 18:00 EDT 2021. Contains 342888 sequences. (Running on oeis4.)