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A285853 as a simple table

n a(n)
2 1
3 6
4 19
5 100
6 508
7 3528
8 24876
9 219168
10 1980576
11 21257280
12 234434880
13 2972885760
14 38715943680
15 566931294720
16 8514866707200
17 141468564787200
18 2407290355814400
19 44753976117043200
20 850965783594393600
21 17505896073523200000
22 367844990453821440000

[1,6,19,100,508,3528,24876,219168,1980576,
 21257280,234434880,2972885760,38715943680,
 566931294720,8514866707200,141468564787200,
 2407290355814400,44753976117043200,
 850965783594393600,17505896073523200000,
 367844990453821440000]

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Last modified April 23 12:55 EDT 2024. Contains 371913 sequences. (Running on oeis4.)