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A038745 as a simple table

na(n)
10
20
3120
42400
533960
6441600
75436960
864509840
9745845120
108461348080
1194558053840
121044594244080
1311426874632880

[0,0,120,2400,33960,441600,5436960,64509840,
 745845120,8461348080,94558053840,1044594244080,
 11426874632880]