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A222347
as a simple table
n
a(n)
1
21
2
108
3
440
4
1690
5
6405
6
24276
7
92340
8
352674
9
1352032
[21,108,440,1690,6405,24276,92340,352674,1352032]
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Last modified April 19 15:11 EDT 2024. Contains 371794 sequences. (Running on oeis4.)
