7012604550
domain: N
Appears in sequences
- Number of symmetric non-crossing connected graphs on n equidistant nodes on a circle.at n=23A089073
- a(n) = binomial(6*n, 3*n)*binomial(3*n, n)/(2*(2*n+1)*binomial(2*n, n)).at n=5A176898
- a(n) = (18*n)!*(4*n)!*(3*n)!/((9*n)!*(8*n)!*(6*n)!*(2*n)!).at n=2A295440
- a(n) = (9*n)!*(2*n)!*(3*n/2)!/((9*n/2)!*(4*n)!*(3*n)!*n!).at n=4A364173