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A247898 as a simple table

na(n)
136
236
354
472
518
636
718
836
936
1036
1118
1236
1336
1418
1518
1636
1736
1854
1918
2018
2190
2236
2354
2418
2518
2618
2736
2818
2954
3018
3136
3236
3318
3418
3536
3636
3718
3836
3936
4018
4154
4218
4372
4418
4536
4654
4718
4818
4936
5018
5190
5218
5336
5436
5518
5618
5718
5818
5918
6072
6118
6236
6318
6436
6518
6618
6718
6818
6918
7018
7136
7218
7318
7418
7554
7618
7718
7818
7918
8018
8118

[36,36,54,72,18,36,18,36,36,36,18,36,36,18,18,36,
 36,54,18,18,90,36,54,18,18,18,36,18,54,18,36,36,
 18,18,36,36,18,36,36,18,54,18,72,18,36,54,18,18,
 36,18,90,18,36,36,18,18,18,18,18,72,18,36,18,36,
 18,18,18,18,18,18,36,18,18,18,54,18,18,18,18,18,
 18]