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A289694 as a simple table

na(n)
10
20
30
41
54
616
764
8236
9818
102736
118934
1228622
1390324
14281792
15871556
162677750
178184383
1824913238
1975593383
20228793147
21691094857
222084237036
236277871658
2418890568921
2556798001639
26170665733660
27512554832309
281538718547049

[0,0,0,1,4,16,64,236,818,2736,8934,28622,90324,
 281792,871556,2677750,8184383,24913238,75593383,
 228793147,691094857,2084237036,6277871658,
 18890568921,56798001639,170665733660,512554832309,
 1538718547049]