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A307826 as a simple table

na(n)
11
21
34
424
5240
62880
746080
8829440
918247680
10510935040
1115328051200
12551809843200
1322072393728000
14927040536576000
1542643864682496000
162217480963489792000
17128613895882407936000
187716833752944476160000
19509311027694335426560000

[1,1,4,24,240,2880,46080,829440,18247680,
 510935040,15328051200,551809843200,22072393728000,
 927040536576000,42643864682496000,
 2217480963489792000,128613895882407936000,
 7716833752944476160000,509311027694335426560000]