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A248727 as a simple table

na(n)
01
12
21
35
45
51
616
724
810
91
1065
11130
1284
1319
141
15326
16815
17720
18265
1936
201
211957
225871
236605
243425
25803
2669
271
2813700
2947950
3065646
3144240
3215106
332394
34134
351
36109601
37438404
38707840
39589106
40267134
4163896
427094
43263
441

[1,2,1,5,5,1,16,24,10,1,65,130,84,19,1,326,815,
 720,265,36,1,1957,5871,6605,3425,803,69,1,13700,
 47950,65646,44240,15106,2394,134,1,109601,438404,
 707840,589106,267134,63896,7094,263,1]