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A068386 as a simple table

na(n)
21
32
47
57
66
721
811
944
1052
1178
1233
1391
1428
15154
16119
17187
18143
1957
20266
2191
22221
23364
24418
25136
26299
27483
28616
29323
30130
31385
32840
33897
341020
351155
361071
371235
38266
39782
40203
41986
421638
431190
441653
451683
462046
472387
481463
492002
50460
512852
522204
53357

[1,2,7,7,6,21,11,44,52,78,33,91,28,154,119,187,
 143,57,266,91,221,364,418,136,299,483,616,323,130,
 385,840,897,1020,1155,1071,1235,266,782,203,986,
 1638,1190,1653,1683,2046,2387,1463,2002,460,2852,
 2204,357]