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A308129
Number of (undirected) Hamiltonian paths on the n X n king graph.
5
1, 12, 392, 171592, 364618672, 6544911081900, 829555065360355292, 817534730458899350635436, 6154392250018061759082363305112, 360916610325065945171647827293872547848, 165298493343313203241690299664254975948394404072
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Hamiltonian Path
Eric Weisstein's World of Mathematics, King Graph
FORMULA
a(n) = A158651(n)/2 for n > 1.
CROSSREFS
Main diagonal of A350729.
Sequence in context: A187513 A138914 A326220 * A356258 A286038 A276482
KEYWORD
nonn,hard
AUTHOR
Eric W. Weisstein, May 14 2019
EXTENSIONS
a(1) corrected by Andrew Howroyd, Jan 16 2022
STATUS
approved