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A291533 as a simple table

na(n)
11
2-4
326
4-208
51859
6-17790
7178308
8-1847882
919640154
10-212911066
112345049018
12-26168243862
13295214515662
14-3361428239216
1538580429168968
16-445874925644701
175184317812361117
18-60603410700370525
19711826341810784570
20-8396670336877539127
2199428914632341468974

[1,-4,26,-208,1859,-17790,178308,-1847882,
 19640154,-212911066,2345049018,-26168243862,
 295214515662,-3361428239216,38580429168968,
 -445874925644701,5184317812361117,
 -60603410700370525,711826341810784570,
 -8396670336877539127,99428914632341468974]