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 A350874 #19 Mar 13 2022 19:03:32 %S A350874 1,1,5,97,25311,165974649 %N A350874 a(n) is the number of nonisomorphic magmas with n elements which satisfy the identity (xx)y = x(xy) for all x and y (so-called left-alternative magmas). %C A350874 Equivalently (by symmetry), a(n) also equals the number of nonisomorphic right-alternative magmas with n elements (that is, magmas satisfying the identity x(yy) = (xy)y for all x and y). %e A350874 There are 10 non-isomorphic magmas with 2 elements, and 5 of these are left-alternative, so a(2) = 5. %Y A350874 Cf. A001329 (magmas), A350875 (left-right-alternative magmas), A350876, A350873. %K A350874 nonn,more,hard %O A350874 0,3 %A A350874 _Joel Brennan_, Jan 20 2022 %E A350874 a(5) from _Andrew Howroyd_, Jan 29 2022