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A159841 as a simple table

na(n)
01
14
21
321
47
51
6120
745
810
91
10715
11286
1278
1313
141
154368
161820
17560
18120
1916
201
2127132
2211628
233876
24969
25171
2619
271
28170544
2974613
3026334
317315
321540
33231
3422
351
361081575
37480700
38177100
3953130
4012650
412300
42300
4325
441
456906900
463108105
471184040
48376740

[1,4,1,21,7,1,120,45,10,1,715,286,78,13,1,4368,
 1820,560,120,16,1,27132,11628,3876,969,171,19,1,
 170544,74613,26334,7315,1540,231,22,1,1081575,
 480700,177100,53130,12650,2300,300,25,1,6906900,
 3108105,1184040,376740]