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A320944 a(n) is the number of perimeter tiles among all rhombic tilings of the 2n-gon. 2
1, 6, 24, 200, 3216 (list; graph; refs; listen; history; text; internal format)
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, Tiling-based 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

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Last modified April 12 21:13 EDT 2021. Contains 342932 sequences. (Running on oeis4.)