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A259805 as a simple table

na(n)
11
21
31
42
54
68
715
831
966
10142
11306
12678
131512
143410
157750
1617786
1741067
1895514
19223295
20525203
211240734
222945383
237019239
2416795983
2540325120
2697153672
27234753693
28568950192

[1,1,1,2,4,8,15,31,66,142,306,678,1512,3410,7750,
 17786,41067,95514,223295,525203,1240734,2945383,
 7019239,16795983,40325120,97153672,234753693,
 568950192]