a(1)=1, then "jump over next square": a(n) = 2*(a(n-1)+1)^2-a(n-1).

A074487

a(1)=1, then "jump over next square": a(n) = 2*(a(n-1)+1)^2-a(n-1).

Terms

    a(0) =1a(1) =7a(2) =121a(3) =29647a(4) =1757978161

External references