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A237405 as a simple table

n a(n)
1 81
2 322
3 1278
4 5228
5 21456
6 87164
7 354008
8 1441060
9 5874828
10 23898504
11 97285848
12 395850152
13 1612369288
14 6560036288
15 26713782880
16 108690607360
17 442654390864
18 1801008543856
19 7334492421904
20 29841672996416
21 121530533355584

[81,322,1278,5228,21456,87164,354008,1441060,
 5874828,23898504,97285848,395850152,1612369288,
 6560036288,26713782880,108690607360,442654390864,
 1801008543856,7334492421904,29841672996416,
 121530533355584]

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Last modified June 6 11:27 EDT 2024. Contains 373127 sequences. (Running on oeis4.)