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A099529 as a simple table

na(n)
01
10
20
3-1
42
5-3
65
7-9
816
9-28
1049
11-86
12151
13-265
14465
15-816
161432
17-2513
184410
19-7739
2013581
21-23833
2241824
23-73396
24128801
25-226030
26396655
27-696081
281221537
29-2143648
303761840
31-6601569
3211584946
33-20330163
3435676949
35-62608681
36109870576
37-192809420
38338356945
39-593775046
401042002567

[1,0,0,-1,2,-3,5,-9,16,-28,49,-86,151,-265,465,
 -816,1432,-2513,4410,-7739,13581,-23833,41824,
 -73396,128801,-226030,396655,-696081,1221537,
 -2143648,3761840,-6601569,11584946,-20330163,
 35676949,-62608681,109870576,-192809420,338356945,
 -593775046,1042002567]