Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 1), (0, -1), (1, -1), (1, 0), (1, 1)}.
A151480
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 1), (0, -1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =3a(4) =30a(5) =65a(6) =434a(7) =1384a(8) =7847a(9) =30749a(10) =162310a(11) =714126a(12) =3667411a(13) =17254387a(14) =88023109a(15) =431259271a(16) =2206144905a(17) =11092437052a(18) =57117060880a(19) =292296895499
External references
- oeis: A151480