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A237958 as a simple table

n a(n)
1 81
2 340
3 1422
4 6042
5 25777
6 109200
7 462852
8 1962464
9 8337456
10 35340888
11 150013756
12 635934272
13 2700293296
14 11446693312
15 48598395488
16 206013123488
17 874700630800
18 3707927149312
19 15742965653824
20 66735768122368
21 283346471210496

[81,340,1422,6042,25777,109200,462852,1962464,
 8337456,35340888,150013756,635934272,2700293296,
 11446693312,48598395488,206013123488,874700630800,
 3707927149312,15742965653824,66735768122368,
 283346471210496]

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Last modified August 12 10:16 EDT 2022. Contains 356069 sequences. (Running on oeis4.)