50880

Appears in sequences

• Number of collinear point-triples in an n X n grid.at n=16A000938
• Number of k's such that A002034(k) = n.at n=23A038024
• Numbers whose base-15 representation has exactly 5 runs.at n=14A043672
• a(n) = Sum_{d|4} phi(d)*n^(4/d).at n=15A054603
• Numbers n such that sum of primes dividing n (with repetition) is equal to the largest prime factor of n+1.at n=33A071863
• Numbers with prime factorization pqrs^6.at n=31A190292
• Expansion of x^3*(1+x+2*x^2+3*x^3+3*x^4+x^5)/(1-x^2-x^3)^3.at n=25A257595
• Molecular topological index of the n-polygon diagonal intersection graph.at n=5A293365
• Triangle read by rows: T(n,k) is the number of ordered partitions of [n] into k nonempty subsets, in which the first subset has size at least 2, n >= 1 and 1 <= k <= n.at n=47A348576
• Number of integer partitions of n with more than one non-mode.at n=42A363124
• Array read by downward antidiagonals: A(n,k) = -A(n-1,k) + (k+1)*A(n-1,k+1) + A(n-1,k+2) with A(0,k) = 1, n >= 0, k >= 0.at n=42A369292