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A306496 as a simple table

na(n)
10
20
31
46
5156
64800
7208440
811939760
9874681920
1079795860480
118873760470400
121181869427692800
13185755937440550400
1434022680848982425600
157183771725162237004800
161732270657442505852672000
17473131604733608510097408000
18145308345869661566419795968000

[0,0,1,6,156,4800,208440,11939760,874681920,
 79795860480,8873760470400,1181869427692800,
 185755937440550400,34022680848982425600,
 7183771725162237004800,1732270657442505852672000,
 473131604733608510097408000,
 145308345869661566419795968000]