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A280980 as a simple table

na(n)
01
12
26
31
424
57
696
731
8384
9127
101632
1131
128064
131663
1424576
158191
16100352
1722527
18455680
19154623
201361920
213676159
22503808
2314847999
241523712
2562242815
2610264576
27219275263
28111755264
29603176959
301384153088
313883761663
3285393408
3316889741311
345026349056

[1,2,6,1,24,7,96,31,384,127,1632,31,8064,1663,
 24576,8191,100352,22527,455680,154623,1361920,
 3676159,503808,14847999,1523712,62242815,10264576,
 219275263,111755264,603176959,1384153088,
 3883761663,85393408,16889741311,5026349056]