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A067645 as a simple table

n a(n)
0 0
1 1
2 1
3 3
4 9
5 21
6 101
7 346
8 1576
9 7040
10 31556
11 153916
12 724758
13 3610768
14 17853814
15 90220450
16 460221672
17 2365627740
18 12300901598 

[0,1,1,3,9,21,101,346,1576,7040,31556,153916,
 724758,3610768,17853814,90220450,460221672,
 2365627740,12300901598]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)