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A231919 as a simple table

na(n)
11
22
3-10
481
5-538
64096
7-12010
865536
919683
101048576
11-3840010
1249268766
13-63920218
14268435456
151073741824
168546887871
17-16921588858
18205383589230
19-272553384010
203291561314526
214398046511104
2217592186044416
23-70180457820010
241406245165407356
25847288609443

[1,2,-10,81,-538,4096,-12010,65536,19683,1048576,
 -3840010,49268766,-63920218,268435456,1073741824,
 8546887871,-16921588858,205383589230,
 -272553384010,3291561314526,4398046511104,
 17592186044416,-70180457820010,1406245165407356,
 847288609443]