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A091521 as a simple table

na(n)
01
14
212
328
484
5212
6632
71544
84584
911220
1033060
1180152
12234648
13565192
141643552
153926832
1611337422
1726852656
1876981660

[1,4,12,28,84,212,632,1544,4584,11220,33060,80152,
 234648,565192,1643552,3926832,11337422,26852656,
 76981660]