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A253290 as a simple table

na(n)
1558
23600
323546
4167832
51184928
68243488
757474376
8402165016
92811886280
1019648735840
11137308874176
12959744819720
136708131042848
1446884212361800
15327678437410752
162290232105294136
1716007076725008072
18111877100758327680

[558,3600,23546,167832,1184928,8243488,57474376,
 402165016,2811886280,19648735840,137308874176,
 959744819720,6708131042848,46884212361800,
 327678437410752,2290232105294136,
 16007076725008072,111877100758327680]