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A094304 as a simple table

na(n)
11
20
31
44
518
696
7600
84320
935280
10322560
113265920
1236288000
13439084800
145748019200
1580951270400
161220496076800
1719615115520000
18334764638208000
196046686277632000
20115242726703104000
212311256907767808000
2248658040163532800000
231072909785605898240000

[1,0,1,4,18,96,600,4320,35280,322560,3265920,
 36288000,439084800,5748019200,80951270400,
 1220496076800,19615115520000,334764638208000,
 6046686277632000,115242726703104000,
 2311256907767808000,48658040163532800000,
 1072909785605898240000]