31070

Appears in sequences

• Arises in classification of base sequences.at n=28A173061
• Cardinality of the set of equivalence classes of the set X_n of finite integer sequences {x_1 = 0, x_2, ..., x_n} satisfying |x_k - x_{k+1}| = 1, where two such sequences are deemed equivalent if they are permutations of each other.at n=20A254007
• Number of dissections of a convex polygon with n+3 sides that have exactly one triangle, and that triangle shares at least one side with the exterior polygon.at n=10A255197
• Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k peaks of width 1 (i.e., UHD configurations, where U=(0,1), H(1,0), D=(0,-1)), (n>=2, k>=0).at n=47A273715
• a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).at n=9A324915
• Squarefree composite numbers m such that k - m^2 < m, where k is the smallest number greater than m^2 such that rad(k) | m.at n=35A362003