A320946 -id:A320946 - cp's OEIS frontend

1, 6, 24, 200, 3216

Offset: 2

Bridget Tenner, Oct 24 2018

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

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

B. E. Tenner, Tiling-based models of perimeter and area, arXiv:1811.00082 [math.CO], 2018.

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

1, 1, 3, 20, 268

Offset: 2

Bridget Tenner, Oct 24 2018

Also the number of bottom-perimeter tiles among all rhombic tilings of the 2n-gon. Tiles and polygons all have sides of length 1, as in A006245.

			a(4) = 3 because among the eight rhombic tilings of the octagon, 3 top-perimeter rhombi appear.

B. E. Tenner, Tiling-based models of perimeter and area, arXiv:1811.00082 [math.CO], 2018.

cp's OEIS Frontend