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A223943 as a simple table

n a(n)
1 2
2 9
3 54
4 321
5 1821
6 9919
7 52532
8 272997
9 1401993
10 7150718
11 36352875
12 184670276
13 938969921
14 4783571827
15 24431153268
16 125119394092 

[2,9,54,321,1821,9919,52532,272997,1401993,
 7150718,36352875,184670276,938969921,4783571827,
 24431153268,125119394092]

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Last modified April 24 08:28 EDT 2024. Contains 371926 sequences. (Running on oeis4.)