a(n) is the number of canonical polygons with 4n edges having 4-fold rotational symmetry.
A307426
a(n) is the number of canonical polygons with 4n edges having 4-fold rotational symmetry.
Terms
- a(0) =2a(1) =2a(2) =7a(3) =22a(4) =79a(5) =289a(6) =1145a(7) =4655a(8) =19314a(9) =81242a(10) =345785a(11) =1484065a(12) =6414999a(13) =27895652
External references
- oeis: A307426