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A047677 as a simple table

na(n)
02
14
224
3288
45760
5172800
67257600
7406425600
829262643200
92633637888000
10289700167680000
1138240422133760000
125965505852866560000
131085722065221713920000
14228001633696559923200000
1554720392087174381568000000
1614883946647711431786496000000

[2,4,24,288,5760,172800,7257600,406425600,
 29262643200,2633637888000,289700167680000,
 38240422133760000,5965505852866560000,
 1085722065221713920000,228001633696559923200000,
 54720392087174381568000000,
 14883946647711431786496000000]