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A015756 as a simple table

na(n)
11
22
33
412
515
66
714
856
9270
1030
11264
1212
1378
1414
1515
164064
17357
18270
19190
20140
2142
22264
233956
24168
2527000
2678
27270
2856
29812
3030
31248
324064
33264
34714
3535
362376
3756536
38190
3978
40840
412214
4242
432580
44264
45270
463956
472109548
4812192
4956252
5027000
51357

[1,2,3,12,15,6,14,56,270,30,264,12,78,14,15,4064,
 357,270,190,140,42,264,3956,168,27000,78,270,56,
 812,30,248,4064,264,714,35,2376,56536,190,78,840,
 2214,42,2580,264,270,3956,2109548,12192,56252,
 27000,357]