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A168296 as a simple table

na(n)
11
21
32
42
518
618
76
8156
9432
10288
1124
12792
137416
1413248
156624
16120
17-11280
1864800
19374400
20496800
21198720
22720
23-62640
24-1254960
254968000
2620865600
2722057920
287352640
295040
3024012000
31-11854080
32-125677440
33389491200
341288103040

[1,1,2,2,18,18,6,156,432,288,24,792,7416,13248,
 6624,120,-11280,64800,374400,496800,198720,720,
 -62640,-1254960,4968000,20865600,22057920,7352640,
 5040,24012000,-11854080,-125677440,389491200,
 1288103040]