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A145223 as a simple table

n a(n)
2 0
3 0
4 6
5 0
6 90
7 420
8 3780
9 33264
10 333900
11 3670920
12 44054010
13 572697840
14 8017775766
15 120266628300
16 1924266063720
17 32712523068960
18 588825415259640
19 11187682889909904
20 223753657798227150
21 4698826813762734240
22 103374189902780197170
23 2377606367763944481780

[0,0,6,0,90,420,3780,33264,333900,3670920,
 44054010,572697840,8017775766,120266628300,
 1924266063720,32712523068960,588825415259640,
 11187682889909904,223753657798227150,
 4698826813762734240,103374189902780197170,
 2377606367763944481780]

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Last modified June 16 03:44 EDT 2019. Contains 324145 sequences. (Running on oeis4.)