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A357247 as a simple table

na(n)
01
11
2-3
313
4-103
51241
6-19691
7384805
8-8918351
9238966705
10-7265920339
11247123552061
12-9295263915191
13383095792217737
14-17167554097899323
15831082449069928021
16-43221681697593767071
172403219105771778162529
18-142263939562414917333155

[1,1,-3,13,-103,1241,-19691,384805,-8918351,
 238966705,-7265920339,247123552061,-9295263915191,
 383095792217737,-17167554097899323,
 831082449069928021,-43221681697593767071,
 2403219105771778162529,-142263939562414917333155]