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A323979 as a simple table

na(n)
01
10
2-60
3-80
41680
54704
6-25660
7-128640
8150420
92062160
102230548
11-19194240
12-63712740
1357664320
14724837020
151055778256
16-3865916310
17-17164305600
18-7987686380
19111558610080
20309981082824
21-83708879920
22-2310552888780
23-4721178106560
244129349973890
2539231750371520
2664807106219940
27-86501225014320
28-580167287063160
29-840576756949440
301330114847500228

[1,0,-60,-80,1680,4704,-25660,-128640,150420,
 2062160,2230548,-19194240,-63712740,57664320,
 724837020,1055778256,-3865916310,-17164305600,
 -7987686380,111558610080,309981082824,
 -83708879920,-2310552888780,-4721178106560,
 4129349973890,39231750371520,64807106219940,
 -86501225014320,-580167287063160,-840576756949440,
 1330114847500228]