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A047121 as a simple table

na(n)
01
12
23
35
49
518
636
769
8134
9263
10526
111052
122085
134143
148250
1516500
1633000
1765851
18131484
19262668
20525336
211050672
222100045
234198157
248393603
2516787206
2633574412
2767136750
28134255332
29268484858
30536969716
311073939432
322147761687

[1,2,3,5,9,18,36,69,134,263,526,1052,2085,4143,
 8250,16500,33000,65851,131484,262668,525336,
 1050672,2100045,4198157,8393603,16787206,33574412,
 67136750,134255332,268484858,536969716,1073939432,
 2147761687]