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A320460 as a simple table

na(n)
11
24
315
448
5190
6600
72205
86720
929988
1095760
11364980
121108800
134813380
1415135120
1557432375
16172972800
17892371480
182916033120
1911616348744
2035384469120
21162510369840
22514937142720
231992665514840
245996736345600
2530797112654000
26100124080056000

[1,4,15,48,190,600,2205,6720,29988,95760,364980,
 1108800,4813380,15135120,57432375,172972800,
 892371480,2916033120,11616348744,35384469120,
 162510369840,514937142720,1992665514840,
 5996736345600,30797112654000,100124080056000]