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A018066 as a simple table

na(n)
01
11
22
34
48
513
622
738
864
9107
10181
11304
12512
13861
141448
152435
164096
176888
1811585
1919483
2032768
2155108
2292681
23155871
24262144
25440871
26741455
271246974
282097152
293526975
305931641
319975792
3216777216

[1,1,2,4,8,13,22,38,64,107,181,304,512,861,1448,
 2435,4096,6888,11585,19483,32768,55108,92681,
 155871,262144,440871,741455,1246974,2097152,
 3526975,5931641,9975792,16777216]