80461

Appears in sequences

• Number of nonisomorphic commutative idempotent groupoids with no symmetry.at n=5A030258
• Triangle: T(n,k), k<=n: commutative groupoids with no symmetry with n elements and k idempotents.at n=20A038022
• Number of (w,x,y,z) with all terms in {1,...,n} and w<x+y+z.at n=17A212090
• Starts of runs of 3 consecutive numbers with the same total binary weight of their divisors (A093653).at n=28A338453