The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A079202 Number of isomorphism classes of non-associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n, listed by class size. 9
 0, 0, 0, 0, 0, 32, 2155, 0, 0, 0, 12, 60, 184, 34544, 147032271 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS A079202(n)+A079203(n)+A079204(n)+A079205(n)+A079197(n)+A079207(n)+A079208(n)+A079209(n)+A063524(n)=A079171(n) Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive divisors of n!) First four rows: 0; 0,0; 0,0,32,2155; 0,0,0,12,60,184,34544,147032271 A079230(x) is equal to the sum of the products of each element in row x of this sequence and the corresponding element of A079210. The sum of each row x of this sequence is given by A079231(x). LINKS Table of n, a(n) for n=1..15. C. van den Bosch, Closed binary operations on small sets Index entries for sequences related to groupoids CROSSREFS Cf. A079203, A079204, A079205, A079197, A079207, A079208, A079209, A079230, A079231. Sequence in context: A268077 A202547 A222830 * A294607 A294953 A239402 Adjacent sequences: A079199 A079200 A079201 * A079203 A079204 A079205 KEYWORD nonn,tabf AUTHOR Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 22 12:22 EDT 2024. Contains 374499 sequences. (Running on oeis4.)