login

A255505 as a simple table

na(n)
01
11
2-1
31
4-1
51
6-691
71
8-3617
943867
10-174611
1177683
12-236364091
13657931
14-3392780147
151723168255201
16-7709321041217
17151628697551
18-26315271553053477373
19154210205991661
20-261082718496449122051
211520097643918070802691

[1,1,-1,1,-1,1,-691,1,-3617,43867,-174611,77683,
 -236364091,657931,-3392780147,1723168255201,
 -7709321041217,151628697551,-26315271553053477373,
 154210205991661,-261082718496449122051,
 1520097643918070802691]