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A253478 as a simple table

na(n)
1558
26804
385280
41066300
513347930
6166986430
72089637292
826146542588
9327171117860
104093826224868
1151225496342820
12640976478054436
138020442466701434
14100358565951977392
151255771461301697900

[558,6804,85280,1066300,13347930,166986430,
 2089637292,26146542588,327171117860,4093826224868,
 51225496342820,640976478054436,8020442466701434,
 100358565951977392,1255771461301697900]