6946816

Appears in sequences

• a(n) = S1(n,1), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).at n=16A089658
• Hankel transform of A186035.at n=16A186036
• Expansion of ((1-x)*(3*x^2-3*x+1))/(1-2*x)^3.at n=18A190050
• a(n) = n^9*(11*n+9)/2.at n=4A229152
• Number of ascending runs in {1,...,4}^n.at n=10A229278
• a(n) is the number of exterior top arches (no covering arch) for semi-meanders in generation n+1 that are generated by semi-meanders with n top arches and floor((n+2)/2) exterior top arches using the exterior arch splitting algorithm.at n=33A365679