A193054 Number of closed Knight's tours on a 7 X 2n board.

0, 0, 1067638, 34524432316, 1250063279938854, 38350427205194670084, 1254934986399237346242334, 40157773188600794694366079616, 1293153423896688571314211086231916, 41575689378315795601749194654016984354, 1337089200028352592236847382536061361269314

Offset: 1

Author

Zhao Hui Du, Jul 15 2011

Keywords

• nonn

Links

• Don Knuth, Table of n, a(n) for n = 1..21 (terms up to a(15) from Zhao Hui Du)
• Chinese Web for the result by KeyTo9_Fans_Zhao Hui Du_

Crossrefs

Cf. A175881, A383663.

Formula

a(n) = A383663(7n). - Don Knuth, May 05 2025