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A208986 as a simple table

na(n)
11
21
31
42
53
65
79
818
935
1073
11151
12324
13691
141503
153277
167212
1715927
1835407
1978967
20176942
21397717
22897079
232029071
244602438
2510464647
2623849545
2754468627
28124646180
29285762575
30656268311
311509570433
323477615648
338022765075

[1,1,1,2,3,5,9,18,35,73,151,324,691,1503,3277,
 7212,15927,35407,78967,176942,397717,897079,
 2029071,4602438,10464647,23849545,54468627,
 124646180,285762575,656268311,1509570433,
 3477615648,8022765075]