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A259604 as a simple table

na(n)
13
26
310
415
510
66
710
815
921
1028
1136
1245
1336
1428
1536
1645
1755
1836
1921
2028
2136
2245
2336
2428
2536
2645
2755
2866
2978
3091
3178
3266
3378
3491
35105
3678
3755
3866
3978
4091
4178
4266
4378
4491
45105
46120
47136
48153
49120
5078
5191
52105
5391
5478
5566
5678
57105
58120
59136
60153
61171
62153

[3,6,10,15,10,6,10,15,21,28,36,45,36,28,36,45,55,
 36,21,28,36,45,36,28,36,45,55,66,78,91,78,66,78,
 91,105,78,55,66,78,91,78,66,78,91,105,120,136,153,
 120,78,91,105,91,78,66,78,105,120,136,153,171,153]