A307426 a(n) is the number of canonical polygons with 4n edges having 4-fold rotational symmetry.

2, 2, 7, 22, 79, 289, 1145, 4655, 19314, 81242, 345785, 1484065, 6414999, 27895652

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Lars Blomberg, Examples of canonical polygons with 4-fold rotational symmetry

Crossrefs

Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.

Sequence in context: A184714 A156464 A156520 * A343577 A342644 A069101

Adjacent sequences: A307423 A307424 A307425 * A307427 A307428 A307429

Keyword

nonn,more

Author

Lars Blomberg, Apr 08 2019

Status

approved