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A291420 as a simple table

na(n)
1341880
28168160
314636160
417957940
552492440
6116396280
71071572040
81187525640
91728483120
105988702720
116609482880
1222539095040
1329239970760
14136496680320
15258670630680
16398648544840
17494892478080
18592003418160
191329673884000
201343798407560
212190884461920

[341880,8168160,14636160,17957940,52492440,
 116396280,1071572040,1187525640,1728483120,
 5988702720,6609482880,22539095040,29239970760,
 136496680320,258670630680,398648544840,
 494892478080,592003418160,1329673884000,
 1343798407560,2190884461920]