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A064633 as a simple table

n a(n)
0 1
1 9
2 216
3 9720
4 699840
5 73483200
6 10581580800
7 1999918771200
8 479980505088000
9 142554210011136000
10 51319515604008960000
11 22016072194119843840000
12 11096100385836401295360000
13 6491218725714294757785600000
14 4362098983680006077231923200000

[1,9,216,9720,699840,73483200,10581580800,
 1999918771200,479980505088000,142554210011136000,
 51319515604008960000,22016072194119843840000,
 11096100385836401295360000,
 6491218725714294757785600000,
 4362098983680006077231923200000]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)