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A003576 as a simple table

na(n)
01
12
28
348
4352
53008
629440
7324096
83947520
952541440
10757260288
1111733385216
12194272854016
133419584921600
1463707979972608
151251489089060864
1625836869372608512
17558946705406427136
1812638569755079344128
19298003073694026432512
207312035980392431353856

[1,2,8,48,352,3008,29440,324096,3947520,52541440,
 757260288,11733385216,194272854016,3419584921600,
 63707979972608,1251489089060864,25836869372608512,
 558946705406427136,12638569755079344128,
 298003073694026432512,7312035980392431353856]