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A073397 as a simple table

n a(n)
0 1
1 18
2 198
3 1680
4 12060
5 76824
6 446952
7 2420352
8 12363120
9 60151520
10 280833696
11 1265442048
12 5528697408
13 23507763840
14 97575960960
15 396398370816
16 1579498956288
17 6184543546368
18 23833455191040

[1,18,198,1680,12060,76824,446952,2420352,
 12363120,60151520,280833696,1265442048,5528697408,
 23507763840,97575960960,396398370816,
 1579498956288,6184543546368,23833455191040]

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)