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A126725 as a simple table

na(n)
10
21
33
412
540
6195
7861
85488
931032
10247005
111706815
1216302396
13133131648
141483518127
1513978823145
16178022175360
171901119947856
1827237392830233
19325091511083547
205175104637744460
2168269217327545080
221195449171318970491

[0,1,3,12,40,195,861,5488,31032,247005,1706815,
 16302396,133131648,1483518127,13978823145,
 178022175360,1901119947856,27237392830233,
 325091511083547,5175104637744460,
 68269217327545080,1195449171318970491]