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A119881 as a simple table

na(n)
01
13
28
318
432
548
6128
7528
8512
9-6912
102048
11357888
128192
13-22351872
1432768
151903822848
16131072
17-209865080832
18524288
1929088886161408
202097152
21-4951498048929792
228388608
231015423886523629568
2433554432
25-246921480190140874752
26134217728
2770251601603944228323328

[1,3,8,18,32,48,128,528,512,-6912,2048,357888,
 8192,-22351872,32768,1903822848,131072,
 -209865080832,524288,29088886161408,2097152,
 -4951498048929792,8388608,1015423886523629568,
 33554432,-246921480190140874752,134217728,
 70251601603944228323328]