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

0,3

Links

Table of n, a(n) for n=0..4.

Wikipedia, Flexible algebra

Example

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

Crossrefs

Cf. A001329 (magmas), A027851.

Sequence in context: A222016 A059491 A024279 * A182788 A232214 A012205

Adjacent sequences: A350870 A350871 A350872 * A350874 A350875 A350876

Keyword

nonn,hard,more

Author

Joel Brennan, Jan 20 2022

Status

approved