Number of Delannoy paths of length n with no EE's crossing the line y = x (i.e., no two consecutive E steps from the line y = x+1 to the line y = x-1).
A110122
Number of Delannoy paths of length n with no EE's crossing the line y = x (i.e., no two consecutive E steps from the line y = x+1 to the line y = x-1).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =53a(4) =247a(5) =1192a(6) =5897a(7) =29723a(8) =152020a(9) =786733a(10) =4111295a(11) =21661168a(12) =114925697a(13) =613442227a(14) =3291704108a(15) =17745496453a(16) =96062011319a(17) =521943400056
External references
- oeis: A110122