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A366267 as a simple table

na(n)
01
12
28
356
4448
53920
636288
7349440
83464448
935125760
10362522624
113795914240
1240224968704
13430579701760
144648899846144
1550568103690240
16553632271155200
176096025799852032
1867464070696927232
19750003531943903232
208371814935842258944

[1,2,8,56,448,3920,36288,349440,3464448,35125760,
 362522624,3795914240,40224968704,430579701760,
 4648899846144,50568103690240,553632271155200,
 6096025799852032,67464070696927232,
 750003531943903232,8371814935842258944]