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A361609 as a simple table

na(n)
01
120
2180
31264
47808
544544
6240640
71249280
86291456
930932992
10149159936
11707788800
123313500160
1315334375424
1470262980608
15319169757184
161438814044160
176442450944000
1828673201668096
19126924873531392
20559101662724096
212451910929940480
2210709243254538240
2346601700831657984

[1,20,180,1264,7808,44544,240640,1249280,6291456,
 30932992,149159936,707788800,3313500160,
 15334375424,70262980608,319169757184,
 1438814044160,6442450944000,28673201668096,
 126924873531392,559101662724096,2451910929940480,
 10709243254538240,46601700831657984]