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A341751 as a simple table

na(n)
21
35
413
513
645
745
8173
9429
10429
111453
123501
137597
147597
1523981
1623981
1723981
18155053
19417197
20941485
211990061
221990061
231990061
2410378669
2510378669
2610378669
2710378669
28144596397
29413031853
30413031853
31413031853
322560515501
336855482797
3415445417389
3515445417389

[1,5,13,13,45,45,173,429,429,1453,3501,7597,7597,
 23981,23981,23981,155053,417197,941485,1990061,
 1990061,1990061,10378669,10378669,10378669,
 10378669,144596397,413031853,413031853,413031853,
 2560515501,6855482797,15445417389,15445417389]