Number of horizontally convex polyoctagons containing n regular polygons (squares or octagons).

A323260

Number of horizontally convex polyoctagons containing n regular polygons (squares or octagons).

Terms

    a(0) =0a(1) =2a(2) =6a(3) =24a(4) =96a(5) =390a(6) =1582a(7) =6422a(8) =26062a(9) =105768a(10) =429228a(11) =1741898a(12) =7068978a(13) =28687370a(14) =116419254a(15) =472453328a(16) =1917312976a(17) =7780851238a(18) =31576298030a(19) =128143125598a(20) =520031215214

External references