Main diagonal of the square array A081297.

A081298

Main diagonal of the square array A081297.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =25a(4) =461a(5) =2821a(6) =84883a(7) =734161a(8) =30684601a(9) =342800821a(10) =18348174791a(11) =251203133545

External references