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A171449 as a simple table

na(n)
0-1
12
24
38
416
532
664
7128
8256
9512
101024
112048
124096
138192
1416384
1532768
1665536
17131072
18262144
19524288
201048576
212097152
224194304
238388608
2416777216
2533554432
2667108864
27134217728
28268435456
29536870912
301073741824
312147483648
324294967296
338589934592

[-1,2,4,8,16,32,64,128,256,512,1024,2048,4096,
 8192,16384,32768,65536,131072,262144,524288,
 1048576,2097152,4194304,8388608,16777216,33554432,
 67108864,134217728,268435456,536870912,1073741824,
 2147483648,4294967296,8589934592]