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A006693 as a simple table

na(n)
12
24
35
47
58
610
725
853
962
10134
11574
122431
1313147
1427167
15229073
16315416
17435474
18771789
191522716
203853889
217878986
227922488
238844776
249182596
259388467
2614781524
27135097360
281374449987
291561240840
304408239956
3111166053604
3212014224315

[2,4,5,7,8,10,25,53,62,134,574,2431,13147,27167,
 229073,315416,435474,771789,1522716,3853889,
 7878986,7922488,8844776,9182596,9388467,14781524,
 135097360,1374449987,1561240840,4408239956,
 11166053604,12014224315]