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A130505 as a simple table

n a(n)
0 1
1 3
2 18
3 54
4 324
5 972
6 5832
7 17496
8 104976
9 314928
10 1889568
11 5668704
12 34012224
13 102036672
14 612220032
15 1836660096
16 11019960576
17 33059881728
18 198359290368
19 595077871104
20 3570467226624
21 10711401679872
22 64268410079232
23 192805230237696

[1,3,18,54,324,972,5832,17496,104976,314928,
 1889568,5668704,34012224,102036672,612220032,
 1836660096,11019960576,33059881728,198359290368,
 595077871104,3570467226624,10711401679872,
 64268410079232,192805230237696]

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Last modified April 25 05:18 EDT 2024. Contains 371964 sequences. (Running on oeis4.)