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%I #12 Oct 03 2017 10:15:46
%S 3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19,20,21,24,26,27,28,30,32,34,
%T 35,36,37,38,39,40,42,45,48,51,52,54,56,57,60,63,64,65,68,70,72,73,74,
%U 76,78,80,81,84,85,90,91,95,96,97,102,104,105,108,109,111,112
%N Tomahawk-constructible n-gons.
%H Andrew M. Gleason, <a href="http://www.jstor.org/stable/2323624">Angle Trisection, the Heptagon and the Triskaidecagon</a>, American Mathematical Monthly, 95 (1988), 185-194.
%F a(n) = A122254(n+2); A122255(a(n)) = 1. - _Reinhard Zumkeller_, Aug 29 2006
%Y Cf. A005109, A048136.
%K nonn
%O 1,1
%A _David W. Wilson_
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