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A121867 as a simple table

na(n)
01
10
2-1
3-3
4-6
5-5
633
7266
81309
94905
1011516
11-22935
12-556875
13-4932512
14-32889885
15-174282151
16-612400262
17907955295
1845283256165
19573855673458
205397236838345
2141604258561397
22250231901787780
23756793798761989
24-8425656230853383
25-213091420659985440
26-2990113204010882473

[1,0,-1,-3,-6,-5,33,266,1309,4905,11516,-22935,
 -556875,-4932512,-32889885,-174282151,-612400262,
 907955295,45283256165,573855673458,5397236838345,
 41604258561397,250231901787780,756793798761989,
 -8425656230853383,-213091420659985440,
 -2990113204010882473]