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A007905 as a simple table

na(n)
00
10
21
34
430
5216
61440
711040
8112560
91229760
1014333760
11179988480
122259290880
1330656102400
14446269824000
156949355212800
16123855443712000
172320686111744000
1845616912653312000
19939726185029632000
2020166054423330816000

[0,0,1,4,30,216,1440,11040,112560,1229760,
 14333760,179988480,2259290880,30656102400,
 446269824000,6949355212800,123855443712000,
 2320686111744000,45616912653312000,
 939726185029632000,20166054423330816000]