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A090158 as a simple table

na(n)
01
10
2-3
39
4-15
515
6-63
7399
8-255
9-7425
10-1023
11355839
12-4095
13-22360065
14-16383
151903790079
16-65535
17-209865211905
18-262143
1929088885637119
20-1048575
21-4951498051026945
22-4194303
231015423886515240959
24-16777215
25-246921480190174429185

[1,0,-3,9,-15,15,-63,399,-255,-7425,-1023,355839,
 -4095,-22360065,-16383,1903790079,-65535,
 -209865211905,-262143,29088885637119,-1048575,
 -4951498051026945,-4194303,1015423886515240959,
 -16777215,-246921480190174429185]