A037292 Number of nonassociative rings with n elements.

1, 2, 2, 55, 2, 4, 2, 801288, 165, 4, 2, 110, 2, 4, 4

Offset

1,2

Comments

The standard definition of a ring requires that multiplication be associative, so these are very nonstandard rings.

The rings need not contain a multiplicative unit.

In fact more is known: 1,2,2,55,2,4,2,801288,165,4,2,110,2,4,4,?,2,330,2,110,4,4,2,1602576.

This sequence may be multiplicative. - Mitch Harris, Apr 19 2005

Links

Table of n, a(n) for n=1..15.

Crossrefs

Cf. A027623.

Sequence in context: A321693 A268536 A323872 * A239151 A368867 A286377

Adjacent sequences: A037289 A037290 A037291 * A037293 A037294 A037295

Keyword

nonn,more

Author

Christian G. Bower, Jun 15 1998

Status

approved