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A156310 as a simple table

na(n)
01
1-5
2-24
3845
43480
5-105125
6-1277064
7216867085
8876529560
9-47866088075
10-967121260104
11129105476445815
121565088635649240
13-123459873187325225
14-3492173223936699144
152542850553653203214525
1610275255401480921258520
17-1059950027391240190578575

[1,-5,-24,845,3480,-105125,-1277064,216867085,
 876529560,-47866088075,-967121260104,
 129105476445815,1565088635649240,
 -123459873187325225,-3492173223936699144,
 2542850553653203214525,10275255401480921258520,
 -1059950027391240190578575]