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A274326 Number of distinct irregular n-gon flexagons. 0
0, 0, 1, 2, 11, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,4

REFERENCES

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

LINKS

Table of n, a(n) for n=2..7.

EXAMPLE

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

CROSSREFS

Cf. A001683.

Sequence in context: A187259 A296593 A125064 * A055329 A193005 A152895

Adjacent sequences:  A274323 A274324 A274325 * A274327 A274328 A274329

KEYWORD

nonn,hard,more

AUTHOR

Christian Schroeder, Jun 18 2016

STATUS

approved

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Last modified April 19 11:58 EDT 2021. Contains 343114 sequences. (Running on oeis4.)