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A309226 as a simple table

na(n)
00
13
28
321
456
5145
6366
7945
82506
96633
1017776
1148521
12133106
13369019
141028404
152880287
168100948
1722877145
1864823568
19184274931
20525282740
211501215193
224299836186
2312340952049
2435486796312
25102220582465
26294917666854
27852123981581
282465458792768

[0,3,8,21,56,145,366,945,2506,6633,17776,48521,
 133106,369019,1028404,2880287,8100948,22877145,
 64823568,184274931,525282740,1501215193,
 4299836186,12340952049,35486796312,102220582465,
 294917666854,852123981581,2465458792768]