Number of lattice paths from (0,0) to (n,n) with steps (0,1), (1,0) and, when on the diagonal, (1,1).
A026671
Number of lattice paths from (0,0) to (n,n) with steps (0,1), (1,0) and, when on the diagonal, (1,1).
Terms
- a(0) =1a(1) =3a(2) =11a(3) =43a(4) =173a(5) =707a(6) =2917a(7) =12111a(8) =50503a(9) =211263a(10) =885831a(11) =3720995a(12) =15652239a(13) =65913927a(14) =277822147a(15) =1171853635a(16) =4945846997a(17) =20884526283a(18) =88224662549a(19) =372827899079
External references
- oeis: A026671