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A047031 as a simple table

na(n)
01
12
23
35
49
518
632
763
8124
9245
10490
11964
121923
133835
147652
1515304
1630504
1760973
18121866
19243596
20487192
21973568
221946851
233893037
247784919
2515569838
2631132592
2762262654
28124519328
29249028126
30498056252
31996046984
321992070217

[1,2,3,5,9,18,32,63,124,245,490,964,1923,3835,
 7652,15304,30504,60973,121866,243596,487192,
 973568,1946851,3893037,7784919,15569838,31132592,
 62262654,124519328,249028126,498056252,996046984,
 1992070217]