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A215971 as a simple table

n a(n)
1 1
2 1
3 2
4 4
5 9
6 20
7 48
8 115
9 286
10 717
11 1815
12 4574
13 11505
14 28546
15 69705
16 166010 

[1,1,2,4,9,20,48,115,286,717,1815,4574,11505,
 28546,69705,166010]

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Last modified April 18 21:51 EDT 2024. Contains 371781 sequences. (Running on oeis4.)