F ← ⊂⟨0◌|+1⟩>⊙(-1⧻),,⊗⊃⊢(↘1). # Generator function (prepends). ⇌⍥F999 [0] # Generate 1000 terms and flip. ⊃(&p↙¯)(&p↙∘)10 # Print first and last 10 terms.