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A146720 as a simple table

na(n)
11
21
31
41
51
61
75
817
943
1065
11175
12507
131901
147015
1535249
16143079
17849399
184342589
1931597665
20199056275
211767268871

[1,1,1,1,1,1,5,17,43,65,175,507,1901,7015,35249,
 143079,849399,4342589,31597665,199056275,
 1767268871]