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A109087 as a simple table

na(n)
01
11
22
3-1
4-2
51
65
7-2
8-16
916
1032
11-62
12-3
1311
1457
15806
16-2700
17-1186
1819710
19-28010
20-56244
21244815
22-169425
23-896555
242589156
25-548641
26-12351073
2727233521
2813281064
29-170962713
30240398832
31486296905
32-2098279338
33921544744
349407106765
35-19435065457
36-18489392170
37126414945507

[1,1,2,-1,-2,1,5,-2,-16,16,32,-62,-3,11,57,806,
 -2700,-1186,19710,-28010,-56244,244815,-169425,
 -896555,2589156,-548641,-12351073,27233521,
 13281064,-170962713,240398832,486296905,
 -2098279338,921544744,9407106765,-19435065457,
 -18489392170,126414945507]