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A147237 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 3
8 19
9 37
10 71
11 177
12 551
13 1807
14 6509
15 26627
16 139987
17 688205
18 4186827
19 24218141
20 169157335
21 1233973193 

[1,1,1,1,1,1,3,19,37,71,177,551,1807,6509,26627,
 139987,688205,4186827,24218141,169157335,
 1233973193]

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Last modified March 28 02:14 EDT 2023. Contains 361576 sequences. (Running on oeis4.)