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A155229 as a simple table

na(n)
31
44
510
619
754
8346
91831
109221
1166079
12717157
138272905
14104484553
151712695513
1636940968544
17931841300560
1827497789520438
191009266090959240
2046345568210962143

[1,4,10,19,54,346,1831,9221,66079,717157,8272905,
 104484553,1712695513,36940968544,931841300560,
 27497789520438,1009266090959240,46345568210962143]