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%I #17 Nov 11 2018 04:51:10
%S 1,1,3,20,268
%N a(n) is the number of top-perimeter tiles among all rhombic tilings of the 2n-gon.
%C 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.
%H B. E. Tenner, <a href="https://arxiv.org/abs/1811.00082">Tiling-based models of perimeter and area</a>, arXiv:1811.00082 [math.CO], 2018.
%e a(4) = 3 because among the eight rhombic tilings of the octagon, 3 top-perimeter rhombi appear.
%Y Cf. A320944, A320946, A006245.
%K nonn,more
%O 2,3
%A _Bridget Tenner_, Oct 24 2018
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