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A257635 as a simple table

na(n)
01
12
21
312
47
51
6120
774
815
91
101680
111066
12251
1326
141
1530240
1619524
175000
18635
1940
201
21665280
22434568
23117454
2416815
251345
2657
271
2817297280
2911393808
303197348
31495544
3245815
332527
3477
351
36518918400
37343976400
3899236556
3916275700
401659889
41107800
424354
43100
441

[1,2,1,12,7,1,120,74,15,1,1680,1066,251,26,1,
 30240,19524,5000,635,40,1,665280,434568,117454,
 16815,1345,57,1,17297280,11393808,3197348,495544,
 45815,2527,77,1,518918400,343976400,99236556,
 16275700,1659889,107800,4354,100,1]