Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 1), (0, 1), (1, -1), (1, 1)}.
A151294
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 1), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =91a(5) =339a(6) =1316a(7) =5064a(8) =19876a(9) =77655a(10) =306653a(11) =1207928a(12) =4787659a(13) =18949972a(14) =75289153a(15) =298902364a(16) =1189498285a(17) =4731773527a(18) =18852187670a(19) =75095222625a(20) =299445133063
External references
- oeis: A151294