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A216643 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 2
13 4
14 8
15 21
16 45
17 159
18 483
19 1397
20 4252
21 12860

[1,1,1,1,1,1,1,1,1,1,1,2,4,8,21,45,159,483,1397,
 4252,12860]

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Last modified January 20 11:06 EST 2020. Contains 331083 sequences. (Running on oeis4.)