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A154415 as a simple table

na(n)
01
10
2-1
32
411
5-50
6-225
71624
86769
9-67284
10-269325
113416930
1213339535
13-206070150
14-790943153
1514409322928
1654631129553
17-1146901283528
18-4308105301929
19102417740732658
20381922055502195
21-10142299865511450

[1,0,-1,2,11,-50,-225,1624,6769,-67284,-269325,
 3416930,13339535,-206070150,-790943153,
 14409322928,54631129553,-1146901283528,
 -4308105301929,102417740732658,381922055502195,
 -10142299865511450]