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 A183265 #7 May 12 2020 19:56:48 %S A183265 3,80,860,6576,42112,242688,1306944,6721280,33448448,162435072, %T A183265 774052864,3633229824,16842670080,77264322560,351273107456, %U A183265 1584582819840,7098965819392,31609517506560,139978221551616,616818283642880,2705880365662208,11821908555202560,51457052429516800 %N A183265 Number of singly defective permutations of 1..n+2 with exactly 2 maxima. %C A183265 A singly defective permutation omits one value and repeats another value. %H A183265 Andrew Howroyd, <a href="/A183265/b183265.txt">Table of n, a(n) for n = 1..200</a> %e A183265 Some solutions for n=3 with 2 maxima: %e A183265 (1,4,2,3,2) (3,5,1,4,5) (4,1,2,5,2) (3,2,2,4,1) (2,1,4,5,2) (4,4,3,1,2). %Y A183265 Column 2 of A183270. %K A183265 nonn %O A183265 1,1 %A A183265 _R. H. Hardin_, Jan 03 2011 %E A183265 Terms a(14) and beyond from _Andrew Howroyd_, May 12 2020