Number of lattice paths from (0,0) to (n,n) using steps (1,0), (1,1), (1,2), and (2,1).
A191354
Number of lattice paths from (0,0) to (n,n) using steps (1,0), (1,1), (1,2), and (2,1).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =25a(5) =75a(6) =227a(7) =693a(8) =2139a(9) =6645a(10) =20757a(11) =65139a(12) =205189a(13) =648427a(14) =2054775a(15) =6526841a(16) =20775357a(17) =66251247a(18) =211617131a(19) =676930325a(20) =2168252571a(21) =6953348149a(22) =22322825865a(23) =71735559255a(24) =230735316795a(25) =742773456825
External references
- oeis: A191354