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A341990 as a simple table

n a(n)
1 0
2 1
3 4
4 12
5 40
6 128
7 402
8 1278
9 4040
10 12776
11 40417
12 127803
13 404136
14 1277995
15 4041401
16 12779996
17 40413886
18 127799963 

[0,1,4,12,40,128,402,1278,4040,12776,40417,127803,
 404136,1277995,4041401,12779996,40413886,
 127799963]

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Last modified June 1 10:29 EDT 2024. Contains 373016 sequences. (Running on oeis4.)