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A001893 as a simple table

n a(n)
3 1
4 3
5 9
6 29
7 98
8 343
9 1230
10 4489
11 16599
12 61997
13 233389
14 884170
15 3366951
16 12876702
17 49424984
18 190297064
19 734644291
20 2842707951
21 11022366544
22 42815701060
23 166583279325
24 649063995030
25 2532267577126
26 9891097066760
27 38676401680776
28 151381995733542
29 593053313030007

[1,3,9,29,98,343,1230,4489,16599,61997,233389,
 884170,3366951,12876702,49424984,190297064,
 734644291,2842707951,11022366544,42815701060,
 166583279325,649063995030,2532267577126,
 9891097066760,38676401680776,151381995733542,
 593053313030007]

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)