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A009048 as a simple table

na(n)
01
10
2-1
3-6
4-19
5-20
6203
71862
89305
920472
10-159849
11-2441230
12-17558715
13-60043100
14365766243
158445023358
1680287239857
17383311153776
18-1756145007825
19-61596647223446
20-735340088843107
21-4522824431862308
2215016682566162427

[1,0,-1,-6,-19,-20,203,1862,9305,20472,-159849,
 -2441230,-17558715,-60043100,365766243,8445023358,
 80287239857,383311153776,-1756145007825,
 -61596647223446,-735340088843107,
 -4522824431862308,15016682566162427]