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A157398 as a simple table

na(n)
11
21
34
41
512
628
71
872
9112
10280
111
12280
131400
141400
153640
161
171740
1815120
1921000
2021840
2158240
221
238484
24126420
25401800
26382200
27407680
281106560
291
3057232
311538208
326370000
338357440
348153600
358852480
3624344320
371

[1,1,4,1,12,28,1,72,112,280,1,280,1400,1400,3640,
 1,1740,15120,21000,21840,58240,1,8484,126420,
 401800,382200,407680,1106560,1,57232,1538208,
 6370000,8357440,8153600,8852480,24344320,1]