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A356907 as a simple table

na(n)
01
1-1
22
3-2
42
50
6-4
712
8-22
934
10-42
1138
12-6
13-68
14202
15-394
16616
17-782
18730
19-204
20-1104
213486
22-6994
2311142
24-14452
2514026
26-5296
27-17558
2860042
29-123860
30201128
31-266384
32268176
33-124034
34-273626
351030396
36-2188864
373624290
38-4898740
395101306
40-2744408

[1,-1,2,-2,2,0,-4,12,-22,34,-42,38,-6,-68,202,
 -394,616,-782,730,-204,-1104,3486,-6994,11142,
 -14452,14026,-5296,-17558,60042,-123860,201128,
 -266384,268176,-124034,-273626,1030396,-2188864,
 3624290,-4898740,5101306,-2744408]