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A167484 as a simple table

na(n)
11
21
36
4108
54320
6324000
740824000
88001504000
92304433152000
10933295426560000
11513312484608000000
12372664863825408000000
13348814312540581888000000
14412647331735508373504000000
15606591577651197309050880000000
161091864839772155156291584000000000
172375897891344209620090486784000000000

[1,1,6,108,4320,324000,40824000,8001504000,
 2304433152000,933295426560000,513312484608000000,
 372664863825408000000,348814312540581888000000,
 412647331735508373504000000,
 606591577651197309050880000000,
 1091864839772155156291584000000000,
 2375897891344209620090486784000000000]