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%I #23 Apr 18 2016 17:35:21
%S 1,5,116,15785,11599297,47212453928,1100377983366327,
%T 148568527921382084692
%N Number of ways to trisect a hexagon with side length n exactly into three identical parts in a triangular lattice.
%H G. P. Jelliss, <a href="http://www.mayhematics.com/j/gpj22.htm#(3)">Dissected Hexagons</a>, The Games and Puzzles Journal, Issue 22, January-April 2002.
%H Luca Petrone, <a href="/A268606/a268606.pdf">Illustration showing a(3) = 116</a>
%Y Cf. A257952, A271741, A271857.
%K nonn,hard,more
%O 1,2
%A _Luca Petrone_, Feb 08 2016
%E Added a(6) from Jelliss's website by _Vaclav Kotesovec_, Mar 03 2016
%E a(7)-a(8) from _Andrew Howroyd_, Apr 11 2016
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