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A317660 as a simple table

na(n)
01
11
21
3720
41
55040
61036800
710080
83628800
924634368000
106350400
11747242496000
123476402012160000
13105670656000
1411298306539520000
151489290622009344000000
162259661307904000
176688268793387417600000
18920024174652492349440000000
198655406673795481600000

[1,1,1,720,1,5040,1036800,10080,3628800,
 24634368000,6350400,747242496000,3476402012160000,
 105670656000,11298306539520000,
 1489290622009344000000,2259661307904000,
 6688268793387417600000,
 920024174652492349440000000,
 8655406673795481600000]