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A006722 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 3
7 5
8 9
9 23
10 75
11 421
12 1103
13 5047
14 41783
15 281527
16 2534423
17 14161887
18 232663909
19 3988834875
20 45788778247
21 805144998681
22 14980361322965
23 620933643034787
24 16379818848380849
25 369622905371172929
26 20278641689337631649
27 995586066665500470689

[1,1,1,1,1,1,3,5,9,23,75,421,1103,5047,41783,
 281527,2534423,14161887,232663909,3988834875,
 45788778247,805144998681,14980361322965,
 620933643034787,16379818848380849,
 369622905371172929,20278641689337631649,
 995586066665500470689]

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Last modified February 24 06:13 EST 2018. Contains 299597 sequences. (Running on oeis4.)