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A191966 as a simple table

na(n)
11
21
31
412
515
6900
76615
890720
91995840
101360800
11197920800
12359251200
131297296000
147264857600
15119870150400
162615348736000
1729640619008000
18533531142144000
19101370917007360000
20101370917007360000
21425757851430912000
223325168819675422720000

[1,1,1,12,15,900,6615,90720,1995840,1360800,
 197920800,359251200,1297296000,7264857600,
 119870150400,2615348736000,29640619008000,
 533531142144000,101370917007360000,
 101370917007360000,425757851430912000,
 3325168819675422720000]