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A006454 as a simple table

na(n)
00
13
215
3120
4528
54095
617955
7139128
8609960
94726275
1020720703
11160554240
12703893960
135454117903
1423911673955
15185279454480
16812293020528
176294047334435
1827594051024015
19213812329916328
20937385441796000
217263325169820735
2231843510970040003
23246739243443988680

[0,3,15,120,528,4095,17955,139128,609960,4726275,
 20720703,160554240,703893960,5454117903,
 23911673955,185279454480,812293020528,
 6294047334435,27594051024015,213812329916328,
 937385441796000,7263325169820735,
 31843510970040003,246739243443988680]