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A013074 as a simple table

na(n)
01
10
2-4
36
45
5-10
6-220
7525
88485
9-46260
10-197750
11-1170125
1286033725
13-778687650
141197306500
15-78964192125
163166659679625
17-40031792593000
18227546036519750
19-8010745066189125
20311948554085325625

[1,0,-4,6,5,-10,-220,525,8485,-46260,-197750,
 -1170125,86033725,-778687650,1197306500,
 -78964192125,3166659679625,-40031792593000,
 227546036519750,-8010745066189125,
 311948554085325625]