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A337481 as a simple table

na(n)
00
10
21
31
45
511
625
755
8117
9241
10493
111001
122019
134061
148149
1516331
1632705
1765461
18130981
19262037
20524161
211048425
222096975
234194097
248388365
2516776933
2633554103
2767108481
28134217285
29268434945
30536870321
311073741145
322147482869
334294966401
348589933569

[0,0,1,1,5,11,25,55,117,241,493,1001,2019,4061,
 8149,16331,32705,65461,130981,262037,524161,
 1048425,2096975,4194097,8388365,16776933,33554103,
 67108481,134217285,268434945,536870321,1073741145,
 2147482869,4294966401,8589933569]