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A216486 as a simple table

na(n)
00
11
2-1
34
4-3
514
6-10
748
8-37
9166
10-144
11582
12-570
132067
14-2260
157421
16-8923
1726878
18-35020
1998039
20-136612
21359649
22-529990
231325491
24-2046310
254903786
26-7868991
2718199354
28-30157768
2967720279
30-115255425
31252540383
32-439456837
33943488036

[0,1,-1,4,-3,14,-10,48,-37,166,-144,582,-570,2067,
 -2260,7421,-8923,26878,-35020,98039,-136612,
 359649,-529990,1325491,-2046310,4903786,-7868991,
 18199354,-30157768,67720279,-115255425,252540383,
 -439456837,943488036]