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

A156509 as a simple table

na(n)
22
312
4390
512963
61881506
71336889688
89293294524192
9249490585063875516

[2,12,390,12963,1881506,1336889688,9293294524192,
 249490585063875516]