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A127945 as a simple table

na(n)
01
1-4
2-32
3512
416384
5-1048576
6-134217728
734359738368
817592186044416
9-18014398509481984
10-36893488147419103232
11151115727451828646838272
121237940039285380274899124224
13-20282409603651670423947251286016

[1,-4,-32,512,16384,-1048576,-134217728,
 34359738368,17592186044416,-18014398509481984,
 -36893488147419103232,151115727451828646838272,
 1237940039285380274899124224,
 -20282409603651670423947251286016]