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A051694 as a simple table

na(n)
12
23
35
421
555
613
734
82584
946368
10377
11832040
124181
136765
14701408733
15987
16196418
17591286729879
18610
1972723460248141
20190392490709135
2124157817
228944394323791464
23160500643816367088
2489
257778742049
2612586269025

[2,3,5,21,55,13,34,2584,46368,377,832040,4181,
 6765,701408733,987,196418,591286729879,610,
 72723460248141,190392490709135,24157817,
 8944394323791464,160500643816367088,89,7778742049,
 12586269025]