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A154659 as a simple table

na(n)
01
11
22
36
424
5120
6720
75040
840320
9362880
103628800
1139916800
12402796800
133770686080
1433187593600
15278598101040
162261952938160
1717986137205800
18141564484858104
191112444773251726
208787513806478134
2170146437009397871
22568128719132038153
234647312969412825372

[1,1,2,6,24,120,720,5040,40320,362880,3628800,
 39916800,402796800,3770686080,33187593600,
 278598101040,2261952938160,17986137205800,
 141564484858104,1112444773251726,8787513806478134,
 70146437009397871,568128719132038153,
 4647312969412825372]