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A307426 a(n) is the number of canonical polygons with 4n edges having 4-fold rotational symmetry. 8
2, 2, 7, 22, 79, 289, 1145, 4655, 19314, 81242, 345785, 1484065, 6414999, 27895652 (list; graph; refs; listen; history; text; internal format)
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 * A069101 A221648 A138802

Adjacent sequences:  A307423 A307424 A307425 * A307427 A307428 A307429

KEYWORD

nonn,more

AUTHOR

Lars Blomberg, Apr 08 2019

STATUS

approved

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Last modified June 5 09:32 EDT 2020. Contains 334829 sequences. (Running on oeis4.)