Triangle read by rows: T(n,k) (0 <= k <= floor(n/2)) is the number of Delannoy paths of length n, having k 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).
A110121
Triangle read by rows: T(n,k) (0 <= k <= floor(n/2)) is the number of Delannoy paths of length n, having k 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).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =1a(4) =53a(5) =10a(6) =247a(7) =73a(8) =1a(9) =1192a(10) =474a(11) =17a(12) =5897a(13) =2908a(14) =183a(15) =1a(16) =29723a(17) =17290a(18) =1602a(19) =24a(20) =152020a(21) =100891a(22) =12475a(23) =342a(24) =1a(25) =786733a(26) =581814a(27) =90205a(28) =3780a(29) =31
External references
- oeis: A110121