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A012472 as a simple table

na(n)
01
10
21
3-3
44
5-40
6250
7-1260
814012
9-133992
101310660
11-16809980
12215083592
13-2938291200
1445330896832
15-728363224680
1612475447944528
17-230003712851648
184451144492528080
19-91010462837366448

[1,0,1,-3,4,-40,250,-1260,14012,-133992,1310660,
 -16809980,215083592,-2938291200,45330896832,
 -728363224680,12475447944528,-230003712851648,
 4451144492528080,-91010462837366448]