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A008420 as a simple table

na(n)
01
120
2200
31340
46800
528004
697880
7299660
8822560
92060980
104780008
1110377180
1221278640
1341517060
1477548920
15139380012
16242080320
17407782740
18668274440
191068305020
201669752016
212556801700
223842321560
235675620300

[1,20,200,1340,6800,28004,97880,299660,822560,
 2060980,4780008,10377180,21278640,41517060,
 77548920,139380012,242080320,407782740,668274440,
 1068305020,1669752016,2556801700,3842321560,
 5675620300]