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A317996 as a simple table

na(n)
01
11
2-2
31
419
5-128
6379
71549
8-32600
9261631
10-845909
11-10713602
12237695149
13-2513395259
1411792378662
15151915180429
16-4826456213273
1770741388773960
18-558513179369297
19-2833805536521839
20200720356696607416
21-4256279445015662093
2254120395442382043743
23-173423789950999240226

[1,1,-2,1,19,-128,379,1549,-32600,261631,-845909,
 -10713602,237695149,-2513395259,11792378662,
 151915180429,-4826456213273,70741388773960,
 -558513179369297,-2833805536521839,
 200720356696607416,-4256279445015662093,
 54120395442382043743,-173423789950999240226]