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A156933 as a simple table

na(n)
01
11
21
3-11
4156
5-627
6736
7591
8-1116
9-369
10-6
11106
12-2772
1376070
14-1087552
158632650
16-40358780
17106452214
18-99774996
19-284430514
201125952500
21-1581820542
22737716032
23414532350
24-357790500
25-81870750
26-1275750

[1,1,1,-11,156,-627,736,591,-1116,-369,-6,106,
 -2772,76070,-1087552,8632650,-40358780,106452214,
 -99774996,-284430514,1125952500,-1581820542,
 737716032,414532350,-357790500,-81870750,-1275750]