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A144085 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 108
5 780
6 6600
7 63840
8 693840
9 8361360
10 110557440
11 1590351840
12 24713156160
13 412393101120
14 7352537512320
15 139443752448000
16 2802408959750400
17 59479486120454400
18 1329239028813696000
19 31194214921732262400
20 766888191387539020800
21 19707387644116280908800
22 528327710066244459571200

[1,1,4,18,108,780,6600,63840,693840,8361360,
 110557440,1590351840,24713156160,412393101120,
 7352537512320,139443752448000,2802408959750400,
 59479486120454400,1329239028813696000,
 31194214921732262400,766888191387539020800,
 19707387644116280908800,528327710066244459571200]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)