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A147942
as a simple table
n
a(n)
1
1
2
2
3
6
4
16
5
74
6
304
7
1424
8
7946
9
39908
10
231442
11
1351720
12
9447558
13
67300148
14
488187450
15
4266438488
16
36066619444
[1,2,6,16,74,304,1424,7946,39908,231442,1351720, 9447558,67300148,488187450,4266438488,36066619444]
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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)