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A056327 as a simple table

na(n)
10
20
31
44
515
650
7160
8502
91545
104730
1114356
1243474
13131145
14395150
151188580
163572902
1710732065
1832225810
1996733636
20290322394
21871200825
222614097750
237843255300
2423531775502
2570599259185
26211805902490

[0,0,1,4,15,50,160,502,1545,4730,14356,43474,
 131145,395150,1188580,3572902,10732065,32225810,
 96733636,290322394,871200825,2614097750,
 7843255300,23531775502,70599259185,211805902490]