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A279323 as a simple table

na(n)
10
20
316
4152
51536
613776
7118664
8991616
98109024
1065252928
11518482400
124077987584
1331806458880
14246337686272
151896480302208
1614525403049984
17110754291988992
18841167574029312
196366346796688896
2048033932904861696

[0,0,16,152,1536,13776,118664,991616,8109024,
 65252928,518482400,4077987584,31806458880,
 246337686272,1896480302208,14525403049984,
 110754291988992,841167574029312,6366346796688896,
 48033932904861696]