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, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 1)}.
A151484
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, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =15a(4) =61a(5) =269a(6) =1245a(7) =5935a(8) =29128a(9) =145871a(10) =743421a(11) =3843154a(12) =20108453a(13) =106304763a(14) =567011174a(15) =3047948601a(16) =16496553378a(17) =89828010025a(18) =491790403030
External references
- oeis: A151484