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A006721 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 2
6 3
7 5
8 11
9 37
10 83
11 274
12 1217
13 6161
14 22833
15 165713
16 1249441
17 9434290
18 68570323
19 1013908933
20 11548470571
21 142844426789
22 2279343327171
23 57760865728994
24 979023970244321
25 23510036246274433
26 771025645214210753

[1,1,1,1,1,2,3,5,11,37,83,274,1217,6161,22833,
 165713,1249441,9434290,68570323,1013908933,
 11548470571,142844426789,2279343327171,
 57760865728994,979023970244321,23510036246274433,
 771025645214210753]

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Last modified September 17 06:52 EDT 2019. Contains 327119 sequences. (Running on oeis4.)