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A013468 as a simple table

na(n)
01
1-1
2-1
34
45
5-32
6-55
7390
8961
9-6432
10-22463
11134550
12649761
13-3443208
14-22456551
15105379838
16911433121
17-3787776224
18-42942180863
19157078439014
202324211078513
21-7384507525560
22-143088139308519

[1,-1,-1,4,5,-32,-55,390,961,-6432,-22463,134550,
 649761,-3443208,-22456551,105379838,911433121,
 -3787776224,-42942180863,157078439014,
 2324211078513,-7384507525560,-143088139308519]