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A027744 as a simple table

n a(n)
0 1
1 6
2 18
3 144
4 432
5 5400
6 23328
7 254016
8 829440
9 12607488
10 53460000
11 633048768
12 2176782336
13 35784141120
14 173408594688
15 1903214880000
16 6849130659840
17 112370402481120
18 534356527841280
19 6501218491422144
20 20323353600000000
21 367285791437881344
22 1782862092373874688

[1,6,18,144,432,5400,23328,254016,829440,12607488,
 53460000,633048768,2176782336,35784141120,
 173408594688,1903214880000,6849130659840,
 112370402481120,534356527841280,6501218491422144,
 20323353600000000,367285791437881344,
 1782862092373874688]

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Last modified June 5 17:43 EDT 2024. Contains 373107 sequences. (Running on oeis4.)