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A280066 as a simple table

n a(n)
1 3
2 9
3 39
4 170
5 790
6 3729
7 17468
8 82769
9 394904
10 1890877
11 9080800
12 43650638
13 210047292
14 1011165147
15 4869719373
16 23456281889
17 113000007399
18 544411868911
19 2623011742357
20 12638188505237
21 60894518951302
22 293410920660702 

[3,9,39,170,790,3729,17468,82769,394904,1890877,
 9080800,43650638,210047292,1011165147,4869719373,
 23456281889,113000007399,544411868911,
 2623011742357,12638188505237,60894518951302,
 293410920660702]

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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)