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A166907 as a simple table

n a(n)
0 1
1 9
2 108
3 1610
4 28560
5 586320
6 13658904
7 355787568
8 10243342296
9 322939137312
10 11063339361360
11 409194048521778
12 16249995494795920
13 689585033717023224
14 31140529927119263136
15 1490994828293677370148
16 75444108490820383882392

[1,9,108,1610,28560,586320,13658904,355787568,
 10243342296,322939137312,11063339361360,
 409194048521778,16249995494795920,
 689585033717023224,31140529927119263136,
 1490994828293677370148,75444108490820383882392]

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)