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A013213 as a simple table

na(n)
00
10
2-1
33
4-6
523
6-90
791
82520
9-37549
10453600
11-4950539
1246054008
13-322939255
14209249040
1558871058247
16-1726916711520
1736675055548935
18-665460508297536
1910471928861164609
20-129836456400150520

[0,0,-1,3,-6,23,-90,91,2520,-37549,453600,
 -4950539,46054008,-322939255,209249040,
 58871058247,-1726916711520,36675055548935,
 -665460508297536,10471928861164609,
 -129836456400150520]