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A204440 as a simple table

na(n)
01
11
21
32
46
520
680
7384
82016
912096
1082080
11597888
124783104
1341886720
14389145600
153891456000
1641803776000
17472283136000
185667397632000
1972153317376000
20959814696960000
2113437405757440000
22197840194965504000
233028176742219776000
2448450827875516416000

[1,1,1,2,6,20,80,384,2016,12096,82080,597888,
 4783104,41886720,389145600,3891456000,41803776000,
 472283136000,5667397632000,72153317376000,
 959814696960000,13437405757440000,
 197840194965504000,3028176742219776000,
 48450827875516416000]