Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.
A005564
Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.
Terms
- a(0) =6a(1) =20a(2) =45a(3) =84a(4) =140a(5) =216a(6) =315a(7) =440a(8) =594a(9) =780a(10) =1001a(11) =1260a(12) =1560a(13) =1904a(14) =2295a(15) =2736a(16) =3230a(17) =3780a(18) =4389a(19) =5060a(20) =5796a(21) =6600a(22) =7475a(23) =8424a(24) =9450a(25) =10556a(26) =11745a(27) =13020a(28) =14384a(29) =15840
External references
- oeis: A005564