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A103973 as a simple table

na(n)
01
12
24
34
424
516
6160
780
81120
9448
108064
112688
1259136
1316896
14439296
15109824
163294720
17732160
1824893440
194978688
20189190144
2134398208
221444724736
23240787456
2411076222976
251704034304
2685201715200
2712171673600
28657270374400

[1,2,4,4,24,16,160,80,1120,448,8064,2688,59136,
 16896,439296,109824,3294720,732160,24893440,
 4978688,189190144,34398208,1444724736,240787456,
 11076222976,1704034304,85201715200,12171673600,
 657270374400]