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A335868 as a simple table

na(n)
01
1-2
27
3-31
4149
5-631
6475
743210
8-844727
910960505
10-86569889
11-584746911
1246302579229
13-1304510879686
1425366896568707
15-277053418780891
16-4271166460501743
17384590020131637825
18-14617527176248527545
19380117694164438489422
20-5265650620303861935579

[1,-2,7,-31,149,-631,475,43210,-844727,10960505,
 -86569889,-584746911,46302579229,-1304510879686,
 25366896568707,-277053418780891,-4271166460501743,
 384590020131637825,-14617527176248527545,
 380117694164438489422,-5265650620303861935579]