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A282431 as a simple table

na(n)
01
1-120
25400
3-104160
4511800
56770736
6-19504800
7-452207040
8-2959622280
9-12932941080
10-44497080432
11-129918587040
12-335811977760
13-788655411600
14-1714912983360
15-3498061536576
16-6761506680840
17-12481939678320
18-22138262633160
19-37922739116640

[1,-120,5400,-104160,511800,6770736,-19504800,
 -452207040,-2959622280,-12932941080,-44497080432,
 -129918587040,-335811977760,-788655411600,
 -1714912983360,-3498061536576,-6761506680840,
 -12481939678320,-22138262633160,-37922739116640]