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A109478 as a simple table

na(n)
01
10
20
3248
4527
5248
6-30752
7-130696
8-200368
97495800
1048588160
11126194552
12-2193794608
13-19969622408
14-73463606560
15669830215672
168531080372112
1741019957975544
18-191778551466496
19-3690237269626888
20-22269949433683824
2141136485483971064
221589563554053105888

[1,0,0,248,527,248,-30752,-130696,-200368,7495800,
 48588160,126194552,-2193794608,-19969622408,
 -73463606560,669830215672,8531080372112,
 41019957975544,-191778551466496,-3690237269626888,
 -22269949433683824,41136485483971064,
 1589563554053105888]