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A339739 as a simple table

na(n)
10
20
30
41
54
611
730
878
9205
10546
111455
124062
1311192
1431889
1588487
16254594
17710683
182047705
195711439
2016455169
2145894868
22132118562
23368149344
241059171430
252950384277
268484556353

[0,0,0,1,4,11,30,78,205,546,1455,4062,11192,31889,
 88487,254594,710683,2047705,5711439,16455169,
 45894868,132118562,368149344,1059171430,
 2950384277,8484556353]