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A112385 6*binomial(4*n-1,n-1)/(4*n-1). +0
2
2, 6, 30, 182, 1224, 8778, 65780, 508950, 4034712, 32602328, 267535086, 2223463866, 18676869400, 158310871740, 1352392098120, 11631593739990, 100637721972216, 875325840117960, 7649219033276888, 67126255864788120, 591311470790795040 (list; graph; listen)
OFFSET

1,1

REFERENCES

Madeline Jones, The Mysterious Flexagons (1966).

M. Kosters, A theory of hexaflexagons, Nieuw Archief Wisk., 17 (1999), 349-362.

LINKS

Vernon Gutenkunst, Trailblazing Hexagons

CROSSREFS

Equals 2*A006632.

Sequence in context: A096769 A111059 A009645 this_sequence A078700 A104561 A127482

Adjacent sequences: A112382 A112383 A112384 this_sequence A112386 A112387 A112388

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Dec 05 2005

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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