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A057647 as a simple table

n a(n)
0 1
1 2
2 9
3 38
4 185
5 914
6 4706
7 24632
8 131309
9 708284
10 3861380
11 21225588
12 117511456
13 654474352
14 3664017964
15 20604973852
16 116332926949
17 659097637368
18 3745842085016
19 21348227213714
20 121974246173946
21 698499504058204

[1,2,9,38,185,914,4706,24632,131309,708284,
 3861380,21225588,117511456,654474352,3664017964,
 20604973852,116332926949,659097637368,
 3745842085016,21348227213714,121974246173946,
 698499504058204]

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Last modified August 4 19:48 EDT 2020. Contains 336202 sequences. (Running on oeis4.)