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A237931 as a simple table

na(n)
1256
21718
311701
481402
5563166
63880918
726804881
8185489824
91282099556
108852862392
1161169759404
12422870170848
132922385929712
1420190059774152
15139517455447976
16964213093638072
176663225933024004
1846041769193957056

[256,1718,11701,81402,563166,3880918,26804881,
 185489824,1282099556,8852862392,61169759404,
 422870170848,2922385929712,20190059774152,
 139517455447976,964213093638072,6663225933024004,
 46041769193957056]