6092032

Appears in sequences

• Number of non-vanishing Feynman diagrams of order 2n for the electron or the photon propagators in quantum electrodynamics.at n=8A005411
• A(n,k) is the sum over all Dyck paths of semilength n of products over all peaks p of (x_p+k*y_p)/y_p, where x_p and y_p are the coordinates of peak p; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=44A258219
• T(n,k) = 1/k! * Sum_{i=0..k} (-1)^(k-i) *C(k,i) * A258219(n,i); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=36A258220