385560

Appears in sequences

• Expansion of e.g.f.: 2/(2-2*x-x^2).at n=8A080599
• Riordan array (1/(1-3x),x(1-x)/(1-3x)^2).at n=48A114195
• Triangle read by rows: coefficients of third-order hypergeometric-harmonic polynomials.at n=33A222063
• Number A(n,k) of ordered set partitions of [n] with at most k elements per block; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=63A276921
• Bi-unitary harmonic numbers.at n=36A286325
• Triangle T(n,m) = C(2*m-1,m)*C(n+2*m-1,n-m).at n=50A338037
• Bi-unitary arithmetic numbers k whose mean bi-unitary divisor is a bi-unitary divisor of k.at n=23A361787
• Number of ordered partitions of an n-set into blocks of size <= sqrt(n).at n=8A368511