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A047021 as a simple table

na(n)
01
12
23
35
49
518
628
753
8101
9195
10390
11704
121371
132676
145253
1510506
1619840
1739056
1876968
19152168
20304336
21586864
221161577
232300544
244565558
259131116
2617813324
2735369544
2870256203
29139745471
30279490942
31549138068
321092533184

[1,2,3,5,9,18,28,53,101,195,390,704,1371,2676,
 5253,10506,19840,39056,76968,152168,304336,586864,
 1161577,2300544,4565558,9131116,17813324,35369544,
 70256203,139745471,279490942,549138068,1092533184]