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 A151653 #8 Jun 11 2023 12:05:49 %S A151653 0,225,1424925,879018750,286691702976,73088118705987, %T A151653 16754170871028591,3661270938396519084,782843888360213140770, %U A151653 165732454316454285337929,34929333979527314682936729,7346819169243119623855847994,1543904846626825596394472048820 %N A151653 Number of permutations of 6 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order. %H A151653 Andrew Howroyd, <a href="/A151653/b151653.txt">Table of n, a(n) for n = 1..200</a> %H A151653 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (495, -92130, 8679772, -464055534, 14968238202, -300963721632, 3837618601236, -31343715730089, 163923909672271, -542603125207206, 1117480735539672, -1416687024832576, 1073300058335232, -445720762271232, 78098756843520). %Y A151653 Column k=4 of A237252. %K A151653 nonn %O A151653 1,2 %A A151653 _R. H. Hardin_, May 29 2009 %E A151653 Terms a(7) and beyond from _Andrew Howroyd_, May 06 2020