Number of returns to the x-axis from above (i.e., d steps hitting the x-axis) in all Grand Motzkin paths of length n.
A109196
Number of returns to the x-axis from above (i.e., d steps hitting the x-axis) in all Grand Motzkin paths of length n.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =35a(4) =112a(5) =350a(6) =1087a(7) =3351a(8) =10286a(9) =31460a(10) =95966a(11) =292110a(12) =887629a(13) =2693423a(14) =8163367a(15) =24717575a(16) =74778718a(17) =226066940a(18) =683006416a(19) =2062412936a(20) =6224697139a(21) =18779180645a(22) =56633215930a(23) =170733734210a(24) =514559844007
External references
- oeis: A109196