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A001465 as a simple table

na(n)
00
10
21
33
46
510
630
7126
8448
91296
104140
1117380
1276296
13296088
141126216
154940040
1623904000
17110455936
18489602448
192313783216
2011960299360
2161878663840
22309644323296
231587272962528
248699800221696
2548793502304000
26268603261201600
271487663739072576

[0,0,1,3,6,10,30,126,448,1296,4140,17380,76296,
 296088,1126216,4940040,23904000,110455936,
 489602448,2313783216,11960299360,61878663840,
 309644323296,1587272962528,8699800221696,
 48793502304000,268603261201600,1487663739072576]