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A222685 as a simple table

n a(n)
1 0
2 4
3 32
4 420
5 2050
6 32296
7 159672
8 2593768
9 13108760
10 215573760
11 1103125848
12 18291819408
13 94349236032
14 1574003841792
15 8162910172992
16 136816063935552
17 712336725800320
18 11983316167337728
19 62579289627023616
20 1055874509971768576 

[0,4,32,420,2050,32296,159672,2593768,13108760,
 215573760,1103125848,18291819408,94349236032,
 1574003841792,8162910172992,136816063935552,
 712336725800320,11983316167337728,
 62579289627023616,1055874509971768576]

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Last modified August 18 15:26 EDT 2024. Contains 375269 sequences. (Running on oeis4.)