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A018958 as a simple table

n a(n)
2 1
3 13
4 23
5 255
6 1076
7 7925
8 45657
9 309062
10 2001564
11 13669028
12 93416132
13 652814448
14 4601924385
15 32846238368
16 236373208105 

[1,13,23,255,1076,7925,45657,309062,2001564,
 13669028,93416132,652814448,4601924385,
 32846238368,236373208105]

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Last modified April 25 16:45 EDT 2024. Contains 371989 sequences. (Running on oeis4.)