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A059227 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 94
5 544
6 3370
7 21878
8 146924
9 1012222
10 7114218
11 50808592
12 367669254
13 2689974234
14 19864822564
15 147875395930
16 1108469655350
17 8359790718480
18 63387403235682
19 482935966313310
20 3695204342149004
21 28383451250732662

[1,1,4,18,94,544,3370,21878,146924,1012222,
 7114218,50808592,367669254,2689974234,19864822564,
 147875395930,1108469655350,8359790718480,
 63387403235682,482935966313310,3695204342149004,
 28383451250732662]

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Last modified June 5 12:10 EDT 2024. Contains 373105 sequences. (Running on oeis4.)