697501

Appears in sequences

• Number of nonisomorphic idempotent groupoids with no symmetry.at n=4A030248
• Triangle: T(n,k), k<=n: groupoids with no symmetry with n elements and k idempotents.at n=14A038019
• Number of arrays of 6 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.at n=8A201814
• Triangle read by rows: number of idempotent basis elements of rank k in partition monoid P_n.at n=31A256042