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A181544 as a simple table

na(n)
01
11
24
31
41
520
648
720
81
91
1054
11405
12760
13405
1454
151
161
17112
181828
198464
2013840
218464
221828
23112
241
251
26200
275925
2852800
29182700
30273504
31182700
3252800
335925
34200
351
361
37324
3815606
39233300
401424925
414050864
425703096
434050864
441424925
45233300
4615606
47324
481
491
50490
5135623
52818300
537917371
5437215794
5591789005
56123519792
5791789005
5837215794
597917371
60818300
6135623
62490
631
641
65704
6673200
672430400
6834657700
69246781248
70955910032
712116980800
722751843600
732116980800
74955910032
75246781248
7634657700
772430400
7873200
79704
801

[1,1,4,1,1,20,48,20,1,1,54,405,760,405,54,1,1,112,
 1828,8464,13840,8464,1828,112,1,1,200,5925,52800,
 182700,273504,182700,52800,5925,200,1,1,324,15606,
 233300,1424925,4050864,5703096,4050864,1424925,
 233300,15606,324,1,1,490,35623,818300,7917371,
 37215794,91789005,123519792,91789005,37215794,
 7917371,818300,35623,490,1,1,704,73200,2430400,
 34657700,246781248,955910032,2116980800,
 2751843600,2116980800,955910032,246781248,
 34657700,2430400,73200,704,1]