20173560
domain: N
Appears in sequences
- a(n) = lcm(1,2,...,2*n) / (n*binomial(2*n, n)).at n=34A068553
- Number of ways to place 3 points on a triangular grid of side n so that they are not vertices of an equilateral triangle of any orientation.at n=30A240440
- Triangle read by rows: the x = 1+q Narayana triangle at m=3.at n=37A243661
- a(n) = 3*binomial(n+1,7).at n=28A253944
- G.f. A(x) satisfies A(x) = 1 + x^4*A(x)^4*(1 + x*A(x)).at n=34A365730