Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, 1), (1, -1), (1, 1)}.
A151350
Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =6a(5) =17a(6) =58a(7) =202a(8) =749a(9) =2901a(10) =11318a(11) =45171a(12) =183265a(13) =756196a(14) =3159230a(15) =13341971a(16) =56903856a(17) =244855696a(18) =1061995972a(19) =4638725316a(20) =20391632508a(21) =90164737708a(22) =400807229526
External references
- oeis: A151350