301455

Appears in sequences

• Group the natural numbers >= 1 so that the n-th group contains n(n+1)/2 numbers and obtain the group sum.at n=19A095166
• Nonzero coefficients of the polynomials (x + d/dx)^n x^2, in row-major order.at n=56A330209
• Triangle read by rows: T(n,k) is the number of linear chord diagrams on 2n vertices with one marked chord such that exactly k of the remaining n-1 chords are contained within the marked chord.at n=34A336599