A193055 Number of closed knight's tours on an 8 X n board.

0, 0, 0, 0, 44202, 55488142, 34524432316, 13267364410532, 7112881119092574, 4235482818156697040, 2122880233853945590892, 1105420672289849239070962, 586820057145837880942582376, 311550865881297158579957164664, 162703111270636640083076205067310

Offset

1,5

Links

Don Knuth, Table of n, a(n) for n = 1..32 (terms up to a(20) from KeyTo9_Fans and Zhao Hui Du)

The Chinese Webpage for the result by KeyTo9_Fans

Zhao Hui Du, C program to calculate terms

Formula

a(n) = A383664(4n). - Don Knuth, May 05 2025

Prog

(C) See Du link.

Crossrefs

Cf. A175881, A193054, A383664.

Sequence in context: A049205 A234426 A187436 * A240099 A245483 A015388

Adjacent sequences: A193052 A193053 A193054 * A193056 A193057 A193058

Keyword

nonn

Author

Zhao Hui Du, Jul 15 2011

Status

approved