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A022690 as a simple table

na(n)
01
1-30
2375
3-2350
45625
518594
6-159470
7264000
8897090
9-3531910
10-1435527
1116983900
1218552080
13-93541590
14-225801585
15676209374
161172571840
17-2433574980
18-6300652790
19673571550
2037882244124

[1,-30,375,-2350,5625,18594,-159470,264000,897090,
 -3531910,-1435527,16983900,18552080,-93541590,
 -225801585,676209374,1172571840,-2433574980,
 -6300652790,673571550,37882244124]