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A125513 as a simple table

na(n)
12
24
38
415
526
648
789
8165
9305
10561
111034
121908
133521
146496
1511982
1622101
1740770
1875210
19138741
20255934
21472117
22870911
231606567
242963628
255466988
2610084919
2718603592
2834317946
2963306130
30116780470
31215424285
32397391986
33733066807

[2,4,8,15,26,48,89,165,305,561,1034,1908,3521,
 6496,11982,22101,40770,75210,138741,255934,472117,
 870911,1606567,2963628,5466988,10084919,18603592,
 34317946,63306130,116780470,215424285,397391986,
 733066807]