28432
domain: N
Appears in sequences
- Square array, read by antidiagonals, where T(n,k) = T(n,k-1) + T(n-1,k+n-1) for n>0, k>0, such that T(n,0) = T(n-1,n-1) for n>0 with T(0,k)=1 for k>=0.at n=29A136730
- Column 1 of square array A136730.at n=6A136731
- Arises in enumerating iterated point-line configurations.at n=42A140744
- Number of trapezoids on an n X n grid (or geoboard).at n=6A189415
- Triangular array: the fission of ((x+2)^n) by ((x+1)^n).at n=34A193846
- Mirror of the triangle A193846.at n=29A193847
- Row sums of A232467.at n=5A232468
- Expansion of x*(1+5*x-2*x^3)/(1-6*x^2+2*x^4).at n=11A249221
- G.f.: Sum_{n>=0} (n+1) * x^n * (1 + x^n)^n.at n=78A326002