

A320944


a(n) is the number of perimeter tiles among all rhombic tilings of the 2ngon.


2




OFFSET

2,2


COMMENTS

Tiles and polygons all have sides of length 1, as in A006245.


LINKS

Table of n, a(n) for n=2..6.
B. E. Tenner, Tilingbased models of perimeter and area, arXiv:1811.00082 [math.CO], 2018.


FORMULA

a(n) = 2*n*A320945(n) for n > 2.


EXAMPLE

a(4) = 24 because among the eight rhombic tilings of the octagon, 24 perimeter rhombi appear.


CROSSREFS

Cf. A320945, A320946, A006245.
Sequence in context: A336267 A018981 A052594 * A277985 A091097 A231317
Adjacent sequences: A320941 A320942 A320943 * A320945 A320946 A320947


KEYWORD

nonn,more


AUTHOR

Bridget Tenner, Oct 24 2018


STATUS

approved



