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A112385
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6*binomial(4*n-1,n-1)/(4*n-1).
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1
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2, 6, 30, 182, 1224, 8778, 65780, 508950, 4034712, 32602328, 267535086, 2223463866, 18676869400, 158310871740, 1352392098120, 11631593739990, 100637721972216, 875325840117960, 7649219033276888, 67126255864788120, 591311470790795040
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| Madeline Jones, The Mysterious Flexagons (1966).
M. Kosters, A theory of hexaflexagons, Nieuw Archief Wisk., 17 (1999), 349-362.
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LINKS
| Vernon Gutenkunst, Trailblazing Hexagons
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MATHEMATICA
| Table[c=4n-1; 6 Binomial[c, n-1]/c, {n, 25}] "(* From Harvey P. Dale, Sep 13 2011 *)"
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CROSSREFS
| Equals 2*A006632.
Sequence in context: A096769 A111059 A009645 * A195154 A078700 A176719
Adjacent sequences: A112382 A112383 A112384 * A112386 A112387 A112388
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 05 2005
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