This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A193054 #28 May 05 2025 15:10:00 %S A193054 0,0,1067638,34524432316,1250063279938854,38350427205194670084, %T A193054 1254934986399237346242334,40157773188600794694366079616, %U A193054 1293153423896688571314211086231916,41575689378315795601749194654016984354,1337089200028352592236847382536061361269314 %N A193054 Number of closed Knight's tours on a 7 X 2n board. %H A193054 Don Knuth, <a href="/A193054/b193054.txt">Table of n, a(n) for n = 1..21</a> (terms up to a(15) from Zhao Hui Du) %H A193054 <a href="http://bbs.emath.ac.cn/thread-3231-5-1.html">Chinese Web for the result</a> by KeyTo9_Fans_Zhao Hui Du_ %F A193054 a(n) = A383663(7n). - _Don Knuth_, May 05 2025 %Y A193054 Cf. A175881, A383663. %K A193054 nonn %O A193054 1,3 %A A193054 _Zhao Hui Du_, Jul 15 2011