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A274326 Number of distinct irregular n-gon flexagons. 0

%I

%S 0,0,1,2,11,40

%N Number of distinct irregular n-gon flexagons.

%D Les Pook, Flexagons inside out, Cambridge University Press, 2003, p. 84.

%e a(6) = 11, because there are 11 distinct irregular hexaflexagons.

%Y Cf. A001683.

%K nonn,hard,more

%O 2,4

%A _Christian Schroeder_, Jun 18 2016

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Last modified May 15 18:26 EDT 2021. Contains 343920 sequences. (Running on oeis4.)