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A274326
Number of distinct irregular n-gon flexagons.
0
0, 0, 1, 2, 11, 40
OFFSET
2,4
REFERENCES
Les Pook, Flexagons inside out, Cambridge University Press, 2003, p. 84.
EXAMPLE
a(6) = 11, because there are 11 distinct irregular hexaflexagons.
CROSSREFS
Cf. A001683.
Sequence in context: A296593 A125064 A361493 * A055329 A193005 A152895
KEYWORD
nonn,hard,more
AUTHOR
Christian Schroeder, Jun 18 2016
STATUS
approved