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 A384035 #6 May 18 2025 02:30:36 %S A384035 1,1,2,4,13,49,228,1034,5133,25710,133872,708976,3846150,21170077, %T A384035 118429072,670537495 %N A384035 Number of vector differences between two permutations of order n, up to multiplication by positive rational numbers and permutations of the components. %e A384035 For n = 3, there are A019589(3) = 5 difference vectors up to permutation of components: (-2, 0, 2), (-2, 1, 1), (-1, -1, 2), (-1, 0, 1), and (0, 0, 0). However, (-2, 0, 2) and (-1, 0, 1) are the same up to a factor 2. Hence, a(3) = 4. %Y A384035 Cf. A019589, A175176, A362968, A381243, A381244, A381339. %K A384035 nonn,more,hard %O A384035 0,3 %A A384035 _Max Alekseyev_, May 17 2025