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A190318 as a simple table

na(n)
10
20
30
44
536
6100
7256
8496
9968
101672
112736
124092
136188
148764
1512144
1616464
1722224
1828928
1937400
2047076
2159244
2273580
2390344
24109000
25132048
26158000
27187528
28220716
29259348
30301388
31350088
32402792
33463176
34529720
35602888
36683092
37774476
38872100
39978232

[0,0,0,4,36,100,256,496,968,1672,2736,4092,6188,
 8764,12144,16464,22224,28928,37400,47076,59244,
 73580,90344,109000,132048,158000,187528,220716,
 259348,301388,350088,402792,463176,529720,602888,
 683092,774476,872100,978232]