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A004309 as a simple table

na(n)
40
510
660
7595
84512
944802
10457040
115159517
1262939040
13829049884
1411727029860
15177384144795
162857827179200
1748865616001564
18883930234491000
1916866107046572417
20338568863790331200
217132984247370166710
22157374949769998613708

[0,10,60,595,4512,44802,457040,5159517,62939040,
 829049884,11727029860,177384144795,2857827179200,
 48865616001564,883930234491000,16866107046572417,
 338568863790331200,7132984247370166710,
 157374949769998613708]