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A009276 as a simple table

na(n)
01
11
2-1
3-4
49
552
6-175
7-1370
85985
960216
10-320063
11-3929550
1224549745
13354693796
14-2543955167
15-42233123938
16341610526145
176404634620016
18-57626692351871
19-1203767371104790
2011918048043239377
21274395314816604636

[1,1,-1,-4,9,52,-175,-1370,5985,60216,-320063,
 -3929550,24549745,354693796,-2543955167,
 -42233123938,341610526145,6404634620016,
 -57626692351871,-1203767371104790,
 11918048043239377,274395314816604636]