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A159308 as a simple table

na(n)
01
11
22
35
414
540
6154
7631
82246
910476
1071232
11383220
121553841
138223567
1458756725
15338290401
161754330940
1711744499990
18103864469131
191220564280222
2017394859369497
21214311637862464
221891506713163679
2310894997683415647

[1,1,2,5,14,40,154,631,2246,10476,71232,383220,
 1553841,8223567,58756725,338290401,1754330940,
 11744499990,103864469131,1220564280222,
 17394859369497,214311637862464,1891506713163679,
 10894997683415647]