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A141513 as a simple table

na(n)
01
12
21
37
48
5101
6207
75120
820417
9961969
107321136
11661511545
129650955373
131669696876968
1446646811310045
1515458287165896835
16827194455797432320
17525025121630724209885
1853809855627730048960875

[1,2,1,7,8,101,207,5120,20417,961969,7321136,
 661511545,9650955373,1669696876968,46646811310045,
 15458287165896835,827194455797432320,
 525025121630724209885,53809855627730048960875]