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A064451 as a simple table

na(n)
11
21
32
42
54
68
724
824
972
10288
11240
12240
131440
142880
152880
1611520
1723040
1846080
19207360
20276480
2182944
22829440
232280960
249123840
2515206400
2660825600
27273715200
281642291200
29766402560
307664025600
311916006400
321277337600

[1,1,2,2,4,8,24,24,72,288,240,240,1440,2880,2880,
 11520,23040,46080,207360,276480,82944,829440,
 2280960,9123840,15206400,60825600,273715200,
 1642291200,766402560,7664025600,1916006400,
 1277337600]