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A212435 as a simple table

na(n)
01
1-1
2-3
311
457
5-361
6-2763
724611
8250737
9-2873041
10-36581523
11512343611
127828053417
13-129570724921
14-2309644635483
1544110959165011
16898621108880097
17-19450718635716001
18-445777636063460643
1910784052561125704811
20274613643571568682777

[1,-1,-3,11,57,-361,-2763,24611,250737,-2873041,
 -36581523,512343611,7828053417,-129570724921,
 -2309644635483,44110959165011,898621108880097,
 -19450718635716001,-445777636063460643,
 10784052561125704811,274613643571568682777]