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A006981 as a simple table

na(n)
01
11
21
31
42
54
68
716
834
972
10157
11343
12766
131718
143899
158898
1620475
1747321
18110024
19256791
20601991
211415768
223340847
237904700
2418752943
2544588803
26106247120
27253644319
28606603025
291453029516
303485707007
318373273835
3220139498217
3348496079939
34116905715114
35282098869730

[1,1,1,1,2,4,8,16,34,72,157,343,766,1718,3899,
 8898,20475,47321,110024,256791,601991,1415768,
 3340847,7904700,18752943,44588803,106247120,
 253644319,606603025,1453029516,3485707007,
 8373273835,20139498217,48496079939,116905715114,
 282098869730]