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A187442 as a simple table

n a(n)
0 1
1 3
2 20
3 126
4 924
5 6435
6 48620
7 352716
8 2704156
9 20058300
10 155117520
11 1166803110
12 9075135300
13 68923264410
14 538257874440
15 4116715363800
16 32247603683100
17 247959266474052
18 1946939425648112
19 15033633249770520
20 118264581564861424 

[1,3,20,126,924,6435,48620,352716,2704156,
 20058300,155117520,1166803110,9075135300,
 68923264410,538257874440,4116715363800,
 32247603683100,247959266474052,1946939425648112,
 15033633249770520,118264581564861424]

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Last modified August 18 19:26 EDT 2024. Contains 375273 sequences. (Running on oeis4.)