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A156347 as a simple table

na(n)
01
1-7
2-30
31603
45970
5-277207
6-3053790
7798236411
82926843890
9-246057649537
10-4510293993150
11926939784063433
1210194432237557010
13-1238037038145567667
14-31770283512126257310
1535614753259364496078267
16130562740697866208097330
17-20734607702641977619141597

[1,-7,-30,1603,5970,-277207,-3053790,798236411,
 2926843890,-246057649537,-4510293993150,
 926939784063433,10194432237557010,
 -1238037038145567667,-31770283512126257310,
 35614753259364496078267,130562740697866208097330,
 -20734607702641977619141597]