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, 0), (-1, 1), (0, 1), (1, 0), (1, 1)}.
A151470
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, 0), (-1, 1), (0, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =18a(4) =94a(5) =386a(6) =1979a(7) =9262a(8) =47785a(9) =238604a(10) =1246969a(11) =6454615a(12) =34187874a(13) =180940665a(14) =969918088a(15) =5211150923a(16) =28218545331a(17) =153283951381a(18) =837083867878
External references
- oeis: A151470