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A307454 a(n) is the number of canonical polygons with 2n edges having 2-fold rotational symmetry. 8
1, 3, 9, 33, 123, 513, 2077, 8759, 37184, 159508, 688446, 2993451, 13082724 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
LINKS
Table of n, a(n) for n=2..14.
Lars Blomberg, Examples of canonical polygons with 2-fold rotational symmetry
CROSSREFS
Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.
Sequence in context: A082841 A151038 A039648 * A219261 A182530 A049182
Adjacent sequences: A307451 A307452 A307453 * A307455 A307456 A307457
KEYWORD
nonn,more
AUTHOR
Lars Blomberg, Apr 09 2019
STATUS
approved

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Last modified May 20 08:05 EDT 2024. Contains 372703 sequences. (Running on oeis4.)