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 A154655 #21 Jan 29 2019 10:36:11 %S A154655 1,1,2,6,24,120,720,5040,30960,172200,899064,4553166,22934774, %T A154655 116914351,610093513,3222826972,17101449940,90706002192,479654768640, %U A154655 2527274267136,13280313508416,69734129749632,366283822765632,1925290900630896,10126754515065868 %N A154655 Number of permutations of length n within distance 6. %C A154655 a(n) equals the permanent of the n X n matrix with 1's along the central thirteen diagonals, and 0's everywhere else. - _John M. Campbell_, Jul 10 2011 %H A154655 Alois P. Heinz, <a href="/A154655/b154655.txt">Table of n, a(n) for n = 0..1000</a> (terms n=1..400 from R. H. Hardin) %H A154655 Torleiv Kløve, <a href="http://www.ii.uib.no/publikasjoner/texrap/pdf/2008-376.pdf">Spheres of Permutations under the Infinity Norm - Permutations with limited displacement</a>, Reports in Informatics, Department of Informatics, University of Bergen, Norway, no. 376, November 2008. %F A154655 G.f. is a rational function f(x)/g(x) where f has degree 482 and g has degree 494. %Y A154655 Cf. A000045, A002524, A002526, A072856, A154654. %Y A154655 Column k=6 of A306209. %K A154655 nonn,easy %O A154655 0,3 %A A154655 _Torleiv Kløve_, Jan 13 2009 %E A154655 a(0)=1 prepended by _Alois P. Heinz_, Jan 28 2019