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 A154654 #27 Jan 29 2019 10:35:51 %S A154654 1,1,2,6,24,120,720,3720,17304,76110,329462,1441923,6487445,29555588, %T A154654 135025756,615260976,2791161792,12618600768,57008446080,257708989200, %U A154654 1166042944564,5279435858788,23908888017477,108262665958797,490132089640318,2218641353956314 %N A154654 Number of permutations of length n within distance 5. %C A154654 a(n) equals the permanent of the n X n matrix with 1's along the eleven central diagonals and 0's everywhere else. - _John M. Campbell_, Jul 10 2011 %H A154654 Alois P. Heinz, <a href="/A154654/b154654.txt">Table of n, a(n) for n = 0..1000</a> (terms n=1..400 from R. H. Hardin) %H A154654 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 A154654 G.f. is a rational function f(x)/g(x) where f has degree 132 and g has degree 142. %Y A154654 Cf. A000045, A002524, A002526, A072856. %Y A154654 Column k=5 of A306209. %K A154654 nonn,easy %O A154654 0,3 %A A154654 _Torleiv Kløve_, Jan 13 2009 %E A154654 a(0)=1 prepended by _Alois P. Heinz_, Jan 28 2019