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A171448 as a simple table

n a(n)
0 1
1 2
2 6
3 24
4 114
5 612
6 3648
7 23928
8 171534
9 1336416
10 11269476
11 102661188
12 1010777052
13 10778107752
14 124698353796
15 1564720622004
16 21217109251374
17 308917754417352
18 4793408454081468
19 78708576907763868
20 1359861042837591204

[1,2,6,24,114,612,3648,23928,171534,1336416,
 11269476,102661188,1010777052,10778107752,
 124698353796,1564720622004,21217109251374,
 308917754417352,4793408454081468,
 78708576907763868,1359861042837591204]

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Last modified September 20 19:41 EDT 2021. Contains 347589 sequences. (Running on oeis4.)