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A138409 as a simple table

na(n)
160
2720
315600
4117600
51771440
64826640
724137280
847045520
9148035360
10594822480
11887502720
122565725040
134750102560
146321361200
1510779213120
1622164358320
1742180530160
1851520370640
1990458377680
20128100278880

[60,720,15600,117600,1771440,4826640,24137280,
 47045520,148035360,594822480,887502720,2565725040,
 4750102560,6321361200,10779213120,22164358320,
 42180530160,51520370640,90458377680,128100278880]