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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
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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
A372577
Adjacent sequences:
A307451
A307452
A307453
*
A307455
A307456
A307457
KEYWORD
nonn
,
more
AUTHOR
Lars Blomberg
, Apr 09 2019
STATUS
approved
