Triangle of numbers S(x,y) = number of lattice paths from (0,0) to (x,y) that use step set { (0,1), (1,0), (2,0), (3,0), ....} and never pass below y = x.
A011117
Triangle of numbers S(x,y) = number of lattice paths from (0,0) to (x,y) that use step set { (0,1), (1,0), (2,0), (3,0), ....} and never pass below y = x.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =7a(9) =11a(10) =1a(11) =4a(12) =12a(13) =28a(14) =45a(15) =1a(16) =5a(17) =18a(18) =52a(19) =121a(20) =197a(21) =1a(22) =6a(23) =25a(24) =84a(25) =237a(26) =550a(27) =903a(28) =1a(29) =7
External references
- oeis: A011117