306180
domain: N
Appears in sequences
- Triangle read by rows: T(n,k) is number of hex trees with n edges and k leaves (n >= 1, 1 <= k <= 1 + floor(n/2)).at n=31A126177
- Triangle read by rows: T(n,k) is number of hex trees with n edges and k vertices of outdegree 1 (0<=k<=n).at n=61A126178
- Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n having k DDU and LDU's.at n=33A128727
- Denominators of Blandin-Diaz compositional Bernoulli numbers C_2,n.at n=13A133005
- Array A(n, k) = (1/2)*(2*n+1)!!*(2*k+1)!!*Integral_{x=-1..1} (1-x^(n+1))*(1-x^(k+1))/(1-x)^2 dx, read by antidiagonals.at n=31A157050
- Array A(n, k) = (1/2)*(2*n+1)!!*(2*k+1)!!*Integral_{x=-1..1} (1-x^(n+1))*(1-x^(k+1))/(1-x)^2 dx, read by antidiagonals.at n=32A157050
- Triangle read by rows, T(n,k) = k^n*A056040(n), n>=0, 0<=k<=n.at n=31A195009
- Numbers k such that A007913(k) divides sigma(k) and A008833(k)-1 either divides A326127(k) (= sigma(k)-core(k)-k), or both are zero.at n=23A336641
- Number of integer grid points on the circle around (0,0) with radius A088959(n).at n=30A365620