Number of polygons on n vertices with four faces such that the source of the polygon lies on exactly two faces.

A128656

Number of polygons on n vertices with four faces such that the source of the polygon lies on exactly two faces.

Terms

    a(0) =2a(1) =8a(2) =44a(3) =240a(4) =1248a(5) =6224a(6) =30052a(7) =141536a(8) =653744a(9) =2973072a(10) =13351192a(11) =59333408a(12) =261378944a(13) =1142885664a(14) =4965331028a(15) =21452209600a(16) =92230169232a(17) =394819386896

External references