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A220411 as a simple table

na(n)
01
1-6
260
3-504
42160
5-3168
6786240
7-51840
81762560
9-82736640
101437004800
11-858470400
12101896704000
13-1881169920
148659353600
15-855305256960
1614071151001600
17-150493593600
188252165711462400
19-70431001804800
2024434139856896000
21-1076294062964736000

[1,-6,60,-504,2160,-3168,786240,-51840,1762560,
 -82736640,1437004800,-858470400,101896704000,
 -1881169920,8659353600,-855305256960,
 14071151001600,-150493593600,8252165711462400,
 -70431001804800,24434139856896000,
 -1076294062964736000]