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A012412 as a simple table

na(n)
01
10
2-1
3-6
4-15
520
6255
770
8-3423
946728
10501375
11-3625358
12-60112239
13420430556
149211149311
15-79037179650
16-2033765765567
1718361020368016
18572833991092479
19-5418169914165654
20-201869115241158607

[1,0,-1,-6,-15,20,255,70,-3423,46728,501375,
 -3625358,-60112239,420430556,9211149311,
 -79037179650,-2033765765567,18361020368016,
 572833991092479,-5418169914165654,
 -201869115241158607]