a(n) is the number of canonical polygons with 4n edges containing only right angles.
A307391
a(n) is the number of canonical polygons with 4n edges containing only right angles.
Terms
- a(0) =2a(1) =0a(2) =2a(3) =2a(4) =8a(5) =14a(6) =62a(7) =196a(8) =892a(9) =3788a(10) =18098a(11) =86302a(12) =427340a(13) =2136248
External references
- oeis: A307391