Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|k>0} which never go above the line y=x.
A175912
Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|k>0} which never go above the line y=x.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =57a(4) =411a(5) =3181a(6) =25803a(7) =216486a(8) =1863139a(9) =16356925a(10) =145914573a(11) =1318844414a(12) =12051758083a(13) =111159508991
External references
- oeis: A175912