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A318495 as a simple table

na(n)
01
110
2120
31540
420500
5279480
63876600
754496200
8774468900
911107261000
10160553895040
112336799457200
1234219387524400
13503846306168800
147455357525594000
15110811908027490960
161653792126235140900
1724774309852363829800
18372404448149589213600

[1,10,120,1540,20500,279480,3876600,54496200,
 774468900,11107261000,160553895040,2336799457200,
 34219387524400,503846306168800,7455357525594000,
 110811908027490960,1653792126235140900,
 24774309852363829800,372404448149589213600]