Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, 0), (1, -1), (1, 0), (1, 1)}.
A151410
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, 0), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =65a(4) =490a(5) =4032a(6) =35244a(7) =321750a(8) =3035890a(9) =29395652a(10) =290621188a(11) =2922898706a(12) =29821640380a(13) =307994453600
External references
- oeis: A151410