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A215515 as a simple table

na(n)
01
1-1
27
3-76
41597
5-41776
61673167
7-74527636
84832747017
9-305644428256
1030618856073947
11-2276081971574236
12390042814538656957
13-20435946140834126176
1410544180964356207226247
15604793906292405974180324
16688972694565220644332739217

[1,-1,7,-76,1597,-41776,1673167,-74527636,
 4832747017,-305644428256,30618856073947,
 -2276081971574236,390042814538656957,
 -20435946140834126176,10544180964356207226247,
 604793906292405974180324,
 688972694565220644332739217]