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A081908 as a simple table

na(n)
01
12
25
314
440
5112
6304
7800
82048
95120
1012544
1130208
1271680
13167936
14389120
15892928
162031616
174587520
1810289152
1922937600
2050855936
21112197632
22246415360
23538968064
241174405120
252550136832
265519704064
2711911823360
2825635586048

[1,2,5,14,40,112,304,800,2048,5120,12544,30208,
 71680,167936,389120,892928,2031616,4587520,
 10289152,22937600,50855936,112197632,246415360,
 538968064,1174405120,2550136832,5519704064,
 11911823360,25635586048]