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A180277 as a simple table

na(n)
1240
22400
340320
472576
594080
6120960
7141120
8311040
9403200
10483840
11483840
12725760
13673920
141010880
151209600
161497600
171411200
181612800
191747200
202246400
212177280
222371200
232449440
242419200
252620800
262903040
273144960
283110400

[240,2400,40320,72576,94080,120960,141120,311040,
 403200,483840,483840,725760,673920,1010880,
 1209600,1497600,1411200,1612800,1747200,2246400,
 2177280,2371200,2449440,2419200,2620800,2903040,
 3144960,3110400]