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 A373865 #11 Jun 19 2024 17:03:10 %S A373865 1,2,8,50,160,892,3794,19560,80112,371948,1614598,7180494,30794746, %T A373865 134269410,574754496,2471353090,10542096528,45057428356,191653403306, %U A373865 814082549052,3444043955350,14537736838038,61174002263338,256838845740468,1075631257186986 %N A373865 Sum over all compositions of 2n into n parts of the least common multiple of the parts. %H A373865 Alois P. Heinz, <a href="/A373865/b373865.txt">Table of n, a(n) for n = 0..75</a> %F A373865 a(n) = A181851(2n,n). %e A373865 a(3) = 50 = 2 + 6*6 + 3*4: 222, 123, 132, 213, 231, 312, 321, 114, 141, 411. %Y A373865 Cf. A005430 (the same for sum), A165817 (the same for product), A181851, A260878 (the same for gcd). %K A373865 nonn %O A373865 0,2 %A A373865 _Alois P. Heinz_, Jun 19 2024