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A157404 as a simple table

na(n)
11
21
34
41
512
636
71
872
9144
10504
111
12280
131800
142520
159576
161
171740
1822320
1937800
2057456
21229824
221
238484
24182700
25864360
261005480
271608768
286664896
291
3057232
312380896
3216546320
3326276544
3432175360
3553319168
36226606464

[1,1,4,1,12,36,1,72,144,504,1,280,1800,2520,9576,
 1,1740,22320,37800,57456,229824,1,8484,182700,
 864360,1005480,1608768,6664896,1,57232,2380896,
 16546320,26276544,32175360,53319168,226606464]