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A064311 as a simple table

na(n)
01
11
2-1
35
4-25
5141
6-849
75349
8-34825
9232445
10-1582081
1110938709
12-76616249
13542472685
14-3876400305
1527919883205
16-202480492905
171477306676445
18-10836099051105
1979861379898165
20-591082795606425

[1,1,-1,5,-25,141,-849,5349,-34825,232445,
 -1582081,10938709,-76616249,542472685,-3876400305,
 27919883205,-202480492905,1477306676445,
 -10836099051105,79861379898165,-591082795606425]