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A181811 as a simple table

na(n)
11
21
32
41
56
62
730
81
94
106
11210
122
132310
1430
1512
161
1730030
184
19510510
206
2160
22210
239699690
242
2536
262310
278
2830
29223092870
3012
316469693230
321
33420
3430030
35180
364
37200560490130
38510510
394620
406
417420738134810
4260
43304250263527210
44210
4524
469699690

[1,1,2,1,6,2,30,1,4,6,210,2,2310,30,12,1,30030,4,
 510510,6,60,210,9699690,2,36,2310,8,30,223092870,
 12,6469693230,1,420,30030,180,4,200560490130,
 510510,4620,6,7420738134810,60,304250263527210,
 210,24,9699690]