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A146632 as a simple table

na(n)
11
21
31
41
51
61
75
815
945
1069
11191
12523
132197
147857
1544519
16172481
171142709
185725361
1946827941
20294096301
212934334465
2222633368087

[1,1,1,1,1,1,5,15,45,69,191,523,2197,7857,44519,
 172481,1142709,5725361,46827941,294096301,
 2934334465,22633368087]