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A153968 as a simple table

n a(n)
0 1
1 2
2 2
3 4
4 15
5 26
6 94
7 703
8 2648
9 19064
10 286301
11 1973740
12 27808647
13 785297090
14 10274423975
15 271526039324

[1,2,2,4,15,26,94,703,2648,19064,286301,1973740,
 27808647,785297090,10274423975,271526039324]

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Last modified July 25 14:35 EDT 2024. Contains 374609 sequences. (Running on oeis4.)