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A006081 as a simple table

na(n)
21
31
43
56
617
744
8133
9404
101319
114392
1215114
1352796
14187410
15671848
162430509
178852584
1832438603
19119463056
20441926206
211641246060
226117011262
2322871513128
2485766691938
25322479555096
261215493792902
274591852445104
2817383416640308
2965937045017304

[1,1,3,6,17,44,133,404,1319,4392,15114,52796,
 187410,671848,2430509,8852584,32438603,119463056,
 441926206,1641246060,6117011262,22871513128,
 85766691938,322479555096,1215493792902,
 4591852445104,17383416640308,65937045017304]