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A144883 as a simple table

n a(n)
0 1
1 3
2 21
3 96
4 684
5 4320
6 35640
7 293760
8 2881440
9 29695680
10 345643200
11 4296499200
12 58518028800
13 851751936000
14 13338801100800
15 222145265664000
16 3934764739584000
17 73675580977152000
18 1455693852146688000
19 30238671742304256000
20 659012259039805440000 

[1,3,21,96,684,4320,35640,293760,2881440,29695680,
 345643200,4296499200,58518028800,851751936000,
 13338801100800,222145265664000,3934764739584000,
 73675580977152000,1455693852146688000,
 30238671742304256000,659012259039805440000]

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Last modified April 24 07:00 EDT 2024. Contains 371920 sequences. (Running on oeis4.)