518859
domain: N
Appears in sequences
- Schroeder's second problem (generalized parentheses); also called super-Catalan numbers or little Schroeder numbers.at n=10A001003
- Signed super-Catalan or little Schroeder numbers.at n=10A080243
- Triangle read by rows: T(n,k) is number of Schroeder paths of length 2n and having k peaks at height 1, for 0 <= k <= n.at n=55A104219
- Triangle read by rows: T(n,k) is the number of Delannoy paths of length n, having k EE's and NN's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1 or two consecutive N steps from the line y = x-1 to the line y = x+1).at n=37A110123
- Triangular array formed by the little Schröder numbers s(n,k).at n=45A110440
- The number of even separable permutations of length n.at n=10A165328
- Riordan array (s(x),x*S(x)) where s(x) is the g.f. of the little Schroeder numbers A001003, and S(x) is the g.f. of the large Schroeder numbers A006318.at n=55A186826
- Riordan array (s(x),x*S(x)) where s(x) is the g.f. of the little Schroeder numbers A001003, and S(x) is the g.f. of the large Schroeder numbers A006318.at n=56A186826
- Fourth-order spt function.at n=17A221142