login

A180897 as a simple table

na(n)
11
20
32
46
530
6180
71260
810080
990720
10907200
119797760
12114287040
131416703680
1418712086480
15260499022680
163833521421760
1759158317014280
18959784091498944

[1,0,2,6,30,180,1260,10080,90720,907200,9797760,
 114287040,1416703680,18712086480,260499022680,
 3833521421760,59158317014280,959784091498944]