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A186990 as a simple table

na(n)
11
22
34
44
512
64
728
816
932
1012
11116
1216
13242
1448
1572
16110
17664
1863
191228
20177
21353
22239
232667
24219
252155
26599
271847
28657
297665
30219
3111613
323047
333297
342209
354946
361057
3724328
383902
396551
402564
4140158
421410
4355194
448308
459490

[1,2,4,4,12,4,28,16,32,12,116,16,242,48,72,110,
 664,63,1228,177,353,239,2667,219,2155,599,1847,
 657,7665,219,11613,3047,3297,2209,4946,1057,24328,
 3902,6551,2564,40158,1410,55194,8308,9490]