A350873 a(n) is the number of non-isomorphic flexible magmas with n elements (i.e., number of magmas with n elements which satisfy the identity (xy)x = x(yx) for all x and y).

1, 1, 6, 191, 72148

Offset: 0

Author

Joel Brennan, Jan 20 2022

Keywords

• nonn
• hard
• more

Examples

			There are 10 non-isomorphic magmas with 2 elements, and 6 of these are flexible magmas, so a(2) = 6.
		

Links

• Wikipedia, Flexible algebra

Crossrefs

Cf. A001329 (magmas), A027851.