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A290180 as a simple table

na(n)
21
3432
439960
5-1418560
617312940
7-71928864
8-462815680
97500885120
10-38038437810
1129000909200
12729783353376
13-4661016429888
1413691625085880
15-16503845217120
16-14982974507520
1745085348093056
1899234456545637
19-157805792764560
20-1644659689877680

[1,432,39960,-1418560,17312940,-71928864,
 -462815680,7500885120,-38038437810,29000909200,
 729783353376,-4661016429888,13691625085880,
 -16503845217120,-14982974507520,45085348093056,
 99234456545637,-157805792764560,-1644659689877680]