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A058987 as a simple table

n a(n)
1 0
2 1
3 3
4 10
5 33
6 111
7 378
8 1303
9 4539
10 15961
11 56598
12 202214
13 727389
14 2632605
15 9581211
16 35047098
17 128791323
18 475281921
19 1760726808
20 6545921136
21 24415415001
22 91340016081
23 342658850427
24 1288774386909
25 4858753673655
26 18358309669651

[0,1,3,10,33,111,378,1303,4539,15961,56598,202214,
 727389,2632605,9581211,35047098,128791323,
 475281921,1760726808,6545921136,24415415001,
 91340016081,342658850427,1288774386909,
 4858753673655,18358309669651]

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Last modified May 17 05:13 EDT 2021. Contains 343965 sequences. (Running on oeis4.)