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A355355 as a simple table

na(n)
01
15
240
3320
42660
523455
6216540
72064055
820137945
9200134600
102019406895
1120635313325
12213109960895
132220820915065
1423323755734820
15246616999661690
162623193780773530
1728049464032800110
18301340494687086960
193251017466141039095
2035207152686408604400

[1,5,40,320,2660,23455,216540,2064055,20137945,
 200134600,2019406895,20635313325,213109960895,
 2220820915065,23323755734820,246616999661690,
 2623193780773530,28049464032800110,
 301340494687086960,3251017466141039095,
 35207152686408604400]