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 A000532 Number of Hamiltonian paths from NW to SW corners in an n X n grid. 12
 1, 1, 2, 8, 86, 1770, 88418, 8934966, 2087813834, 1013346943033, 1111598871478668, 2568944901392936854, 13251059359839620127088, 145194816279817259193401518, 3524171261632305641165676374930 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Walks reaching each cell exactly once. REFERENCES Douglas M. McKenna, Tendril Motifs for Space-Filling, Half-Domino Curves, in Bridges Conference Proceedings, 2016; http://archive.bridgesmathart.org/2016/bridges2016-119.pdf LINKS KeyTo9(AT)Fans, Table of n, a(n) for n = 1..18 KeyTo9(AT)Fans, Chinese web page giving the sequence up to 18 items CROSSREFS Main diagonal of A271592. Cf. A181688, A181689, A014524, A014585. Cf. A001184, A145157, A120443, A003763, A271507, A007764, A121785, A121789. Sequence in context: A261730 A052456 A276991 * A083831 A134245 A141313 Adjacent sequences:  A000529 A000530 A000531 * A000533 A000534 A000535 KEYWORD nonn AUTHOR EXTENSIONS More terms from Zhao Hui Du, Jul 08 2008 Edited by Franklin T. Adams-Watters, Jul 03 2009 Name clarified by Andrew Howroyd, Apr 10 2016 STATUS approved

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Last modified December 11 15:03 EST 2018. Contains 318049 sequences. (Running on oeis4.)