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A073987 as a simple table

n a(n)
1 0
2 1
3 3
4 12
5 126
6 1296
7 9072
8 52488
9 297432
10 1700352
11 9843120
12 58576608
13 356638464
14 2176782336
15 13162730688
16 78940272384
17 471877757568
18 2821109907456
19 16894457846784
20 101361597378048
21 608764662139392
22 3656220357427200
23 21947909832446976
24 131685972252346368

[0,1,3,12,126,1296,9072,52488,297432,1700352,
 9843120,58576608,356638464,2176782336,13162730688,
 78940272384,471877757568,2821109907456,
 16894457846784,101361597378048,608764662139392,
 3656220357427200,21947909832446976,
 131685972252346368]

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Last modified April 19 12:14 EDT 2024. Contains 371792 sequences. (Running on oeis4.)