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A270570 as a simple table

na(n)
21
316
42
516
616
752
84
952
1016
1152
1216
1340
1452
15160
168
1752
1852
1988
2016
2164
2252
23160
2416
2588
2640
279232
2852
2988
30160
319232
3216
33100
3452
35160
3652
37112
3888
39304
4020
419232
4264
43196
4452
45136
46160
479232
4824
49148
5088
51232
5240
53160
549232
559232
5652
57196
5888
59304
60160

[1,16,2,16,16,52,4,52,16,52,16,40,52,160,8,52,52,
 88,16,64,52,160,16,88,40,9232,52,88,160,9232,16,
 100,52,160,52,112,88,304,20,9232,64,196,52,136,
 160,9232,24,148,88,232,40,160,9232,9232,52,196,88,
 304,160]