a(n) = Bo(n^2), n=0,1..., where Bo(n) are the ordered Bell numbers, A000670.

A068942

a(n) = Bo(n^2), n=0,1..., where Bo(n) are the ordered Bell numbers, A000670.

Terms

    a(0) =1a(1) =1a(2) =75a(3) =7087261

External references