login

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

A033981 as a simple table

na(n)
11
25
325
41727
53830879
633554425
719584403931
825086500333
923476467919565
104463061944990945

[1,5,25,1727,3830879,33554425,19584403931,
 25086500333,23476467919565,4463061944990945]