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A231436 as a simple table

na(n)
13
28
321
454
5185
6561
71943
86756
924003
1088488
11325775
121225789
134623559
1417568716
1567018935
16256235910
17982016953
183767662049
1914470021611
2055610192696
21213805376253
22822314635406
233163303832419
2412170737198879
2546831328979593

[3,8,21,54,185,561,1943,6756,24003,88488,325775,
 1225789,4623559,17568716,67018935,256235910,
 982016953,3767662049,14470021611,55610192696,
 213805376253,822314635406,3163303832419,
 12170737198879,46831328979593]