A simple grammar: cycles of pairs of cycles.

A052824

A simple grammar: cycles of pairs of cycles.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =6a(4) =34a(5) =220a(6) =1808a(7) =17388a(8) =194724a(9) =2478096a(10) =35418192a(11) =561533280a(12) =9785418432a(13) =185921027136

External references