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Search: id:A137886
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| A137886 |
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Number of (directed) Hamiltonian paths in the n-crown graph. |
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+0
1
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| 12, 144, 3840, 138240, 6804000, 436504320, 35417088000, 3546005299200, 429451518988800, 61883150757120000, 10463789706751180800
(list; graph; listen)
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OFFSET
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3,1
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LINKS
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Max Alekseyev, PARI/GP Scripts for Miscellaneous Math Problems
Eric Weisstein's World of Mathematics, Hamiltonian Path
Eric Weisstein's World of Mathematics, Crown Graph
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PROGRAM
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(PARI) { A137886(n) = nhp( matrix(2*n, 2*n, i, j, if(min(i, j)<=n && max(i, j)>n && abs(j-i)!=n, 1, 0)) ) }
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CROSSREFS
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Sequence in context: A123237 A143248 A138444 this_sequence A097303 A067219 A075619
Adjacent sequences: A137883 A137884 A137885 this_sequence A137887 A137888 A137889
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KEYWORD
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nonn,more
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AUTHOR
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E. W. Weisstein (eric(AT)weisstein.com), Feb 20, 2008
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EXTENSIONS
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More terms from Max Alekseyev (maxale(AT)gmail.com), Feb 13 2009
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