login

A191995 as a simple table

na(n)
00
11
2-1
3-2
414
5-6
6-406
72220
813768
9-280224
10501824
1134875600
12-394160416
13-3296452368
14129418793776
15-532969950240
16-35512135858048
17654965382945408
185943454902108032
19-395494767434053632
202913398252129581312

[0,1,-1,-2,14,-6,-406,2220,13768,-280224,501824,
 34875600,-394160416,-3296452368,129418793776,
 -532969950240,-35512135858048,654965382945408,
 5943454902108032,-395494767434053632,
 2913398252129581312]