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A007727 as a simple table

na(n)
01
12
24
318
464
5250
6900
73430
812800
948600
10184500
11705430
122703168
1310400598
1440113164
15155117250
16601067520
172333606218
189075085776
1935345263798
20137846344000
21538257870990
222104098258284
238233430727598
2432247600966144

[1,2,4,18,64,250,900,3430,12800,48600,184500,
 705430,2703168,10400598,40113164,155117250,
 601067520,2333606218,9075085776,35345263798,
 137846344000,538257870990,2104098258284,
 8233430727598,32247600966144]