Number of North-East lattice paths from (0,0) to (n,n) that bounce off the diagonal y = x to the right exactly twice.
A268400
Number of North-East lattice paths from (0,0) to (n,n) that bounce off the diagonal y = x to the right exactly twice.
Terms
- a(0) =1a(1) =5a(2) =23a(3) =99a(4) =413a(5) =1691a(6) =6842a(7) =27464a(8) =109631a(9) =435887a(10) =1728018a(11) =6835668a(12) =26996393a(13) =106486529a(14) =419639903a(15) =1652533719a(16) =6504159137a(17) =25589302163a(18) =100646529977a(19) =395775842389
External references
- oeis: A268400