A307519 a(n) is the number of canonical polygons with 4n edges having exactly 4 lines of reflection symmetry.

2, 1, 2, 6, 10, 17, 34, 72, 142, 288, 585, 1195, 2413, 4898

Offset

1,1

Links

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

Lars Blomberg, Examples of canonical polygons with exactly 4 lines of reflection symmetry

Crossrefs

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

Sequence in context: A259992 A110422 A131804 * A254198 A246466 A170829

Adjacent sequences: A307516 A307517 A307518 * A307520 A307521 A307522

Keyword

nonn,more

Author

Lars Blomberg, Apr 12 2019

Status

approved