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A247239 as a simple table

na(n)
01
12
21
33
44
51
64
710
88
91
105
1120
1236
1316
141
156
1635
17120
18136
1932
201
217
2256
23329
24800
25528
2664
271
288
2984
30784
313611
325600
332080
34128
351
369
37120
381680
3913328
4042065
4140000
428256
43256
441
4510
46165
473312
4842048
49241472
50499955
51288000
5232896
53512
541

[1,2,1,3,4,1,4,10,8,1,5,20,36,16,1,6,35,120,136,
 32,1,7,56,329,800,528,64,1,8,84,784,3611,5600,
 2080,128,1,9,120,1680,13328,42065,40000,8256,256,
 1,10,165,3312,42048,241472,499955,288000,32896,
 512,1]