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A248964 as a simple table

na(n)
01
14
240
3160
45600
5896
619200
776800
814784000
919712000
10512512000
11186368000
1219568640000
136021120000
1420889600000
157798784000
1671310131200000
1716778854400000
18503365632000000
1915138816000000
20221798793216000000
216035341312000000

[1,4,40,160,5600,896,19200,76800,14784000,
 19712000,512512000,186368000,19568640000,
 6021120000,20889600000,7798784000,71310131200000,
 16778854400000,503365632000000,15138816000000,
 221798793216000000,6035341312000000]