Number of EE's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1) in all Delannoy paths of length n.
A110127
Number of EE's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1) in all Delannoy paths of length n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =10a(4) =75a(5) =508a(6) =3277a(7) =20566a(8) =126871a(9) =773688a(10) =4679769a(11) =28136546a(12) =168395235a(13) =1004239156a(14) =5971820709a(15) =35429993390a(16) =209800355631
External references
- oeis: A110127