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A128648 as a simple table

na(n)
11
22
34
412
560
65
780
8720
97920
1055440
1155440
126160
136160
1418480
15425040
165525520
17160240080
18160240080
1953413360
2053413360
21480720240
22480720240
2319709529840
2419709529840
2539419059680
26197095298400
273350620072800
28177582863858400

[1,2,4,12,60,5,80,720,7920,55440,55440,6160,6160,
 18480,425040,5525520,160240080,160240080,53413360,
 53413360,480720240,480720240,19709529840,
 19709529840,39419059680,197095298400,
 3350620072800,177582863858400]