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A196869 as a simple table

na(n)
01
16
2-36
3216
4-2592
523328
6-311040
73265920
8-45349632
9517321728
10-7336562688
1188159684608
12-1266403590144
1315771513618432
14-228509902503936
152921050338066432
16-42583086769766400
17555279063084564480
18-8132204141176946688
19107718176292801085440

[1,6,-36,216,-2592,23328,-311040,3265920,
 -45349632,517321728,-7336562688,88159684608,
 -1266403590144,15771513618432,-228509902503936,
 2921050338066432,-42583086769766400,
 555279063084564480,-8132204141176946688,
 107718176292801085440]