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A076928 as a simple table

na(n)
11
21
31
42
52
64
74
816
948
1096
1196
12384
13384
14768
152304
1618432
1718432
18110592
19110592
20442368
211327104
222654208
232654208
2421233664
25106168320
26212336640
271911029760
287644119040
297644119040
3045864714240
3145864714240
32733835427840

[1,1,1,2,2,4,4,16,48,96,96,384,384,768,2304,18432,
 18432,110592,110592,442368,1327104,2654208,
 2654208,21233664,106168320,212336640,1911029760,
 7644119040,7644119040,45864714240,45864714240,
 733835427840]