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A146468 as a simple table

na(n)
11
21
31
41
51
621
761
8413
91837
1012959
11107653
121592585
1319952617
14467249637
159827027521
16347403836941

[1,1,1,1,1,21,61,413,1837,12959,107653,1592585,
 19952617,467249637,9827027521,347403836941]