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A375634 as a simple table

na(n)
01
11
22
312
452
5280
62160
716870
8150080
91557360
1017491600
11215908000
122923905600
1342734091400
14672515043200
1511347480544400
16204142655516800
173902009862150400
1878976503077472000
191687212801048174400
2037941749192547200000

[1,1,2,12,52,280,2160,16870,150080,1557360,
 17491600,215908000,2923905600,42734091400,
 672515043200,11347480544400,204142655516800,
 3902009862150400,78976503077472000,
 1687212801048174400,37941749192547200000]