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A271972 as a simple table

na(n)
01
17
221
335
4-7
5-273
6-1043
7-2261
8-1743
98855
1047621
11128499
12180649
13-176897
14-1972131
15-6650245
16-12796063
17-4632537
1871042293
19316596931
20769091673
21860188175
22-1942889011
23-13792873269
24-41571269999
25-69734967113
2612059021541
27536380855955
282061110273033
294489775100447

[1,7,21,35,-7,-273,-1043,-2261,-1743,8855,47621,
 128499,180649,-176897,-1972131,-6650245,-12796063,
 -4632537,71042293,316596931,769091673,860188175,
 -1942889011,-13792873269,-41571269999,
 -69734967113,12059021541,536380855955,
 2061110273033,4489775100447]