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 A175176 #17 Jun 27 2025 21:43:04 %S A175176 1,1,3,19,201,3081,62663,1598185,49158651,1772832643,73394322615, %T A175176 3431751900897,178904412061235,10290301519034057,647401635395456919, %U A175176 44227879174393279133 %N A175176 Number of vector sums of two permutations of 1,2,...,n. %C A175176 Also, number of vector differences of two permutations of 1,2,...,n. %C A175176 Number of distinct sums up to the order of components is given by A019589. - _Max Alekseyev_, Jun 19 2023 %C A175176 a(n) <= A362968(n). - _Max Alekseyev_, Jun 19 2023 %e A175176 The permutation sums for n=2 are (1,2) + (1,2) = (2,4); (1,2) + (2,1) = (2,1) + (1,2) = (3,3); (2,1) + (2,1) = (4,2); so a(2)=3. %Y A175176 Cf. A019589, A362968. %K A175176 nonn,more %O A175176 0,3 %A A175176 _R. H. Hardin_, Feb 28 2010 %E A175176 a(0)=1 prepended by _Alois P. Heinz_, Jun 19 2023 %E A175176 a(11)-a(15) from _Max Alekseyev_, Jul 02 2023