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A061121 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 20
6 240
7 1470
8 10640
9 83160
10 584640
11 4496030
12 42658440
13 371762820
14 3594871280
15 38650622010
16 396457108320
17 4330689250160
18 53963701424640
19 641211774798510
20 8205894865096280
21 113786291585124060

[0,0,0,0,20,240,1470,10640,83160,584640,4496030,
 42658440,371762820,3594871280,38650622010,
 396457108320,4330689250160,53963701424640,
 641211774798510,8205894865096280,
 113786291585124060]

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Last modified April 23 15:04 EDT 2024. Contains 371914 sequences. (Running on oeis4.)