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A087648 as a simple table

n a(n)
0 1
1 3
2 9
3 31
4 120
5 514
6 2407
7 12205
8 66491
9 386699
10 2388096
11 15589732
12 107165081
13 773106715
14 5836100685
15 45981026703
16 377230766908
17 3215977070706
18 28437411817135
19 260380616093533
20 2464930698184351
21 24091925888687459
22 242802079705721156
23 2520198597834860148

[1,3,9,31,120,514,2407,12205,66491,386699,2388096,
 15589732,107165081,773106715,5836100685,
 45981026703,377230766908,3215977070706,
 28437411817135,260380616093533,2464930698184351,
 24091925888687459,242802079705721156,
 2520198597834860148]

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Last modified April 24 16:34 EDT 2024. Contains 371961 sequences. (Running on oeis4.)