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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A156507 as a simple table

na(n)
32
458
5204
641816
7422538
8169361504
95201763072
105719198097600

[2,58,204,41816,422538,169361504,5201763072,
 5719198097600]