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A013314 as a simple table

na(n)
01
10
2-1
3-6
4-15
50
6183
71162
84305
94032
10-75169
11-720390
12-4057119
13-13316160
1417994039
15691795018
166706003809
1745159313536
18210202685567
19247239745914
20-8759676926319
21-137896385117568
22-1415069646671241

[1,0,-1,-6,-15,0,183,1162,4305,4032,-75169,
 -720390,-4057119,-13316160,17994039,691795018,
 6706003809,45159313536,210202685567,247239745914,
 -8759676926319,-137896385117568,-1415069646671241]