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A006575 as a simple table

na(n)
11
22
34
410
524
660
7156
8410
91092
102952
118052
1222140
1361320
14170820
15478288
161345210
173798240
1810761660
1930585828
2087169608
21249055976
22713205900
232046590844
245883948540
2516945772184
2648882035160
27141214767876

[1,2,4,10,24,60,156,410,1092,2952,8052,22140,
 61320,170820,478288,1345210,3798240,10761660,
 30585828,87169608,249055976,713205900,2046590844,
 5883948540,16945772184,48882035160,141214767876]