Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (1, -1, -1), (1, 1, 1)}.
A149600
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =59a(5) =229a(6) =965a(7) =4055a(8) =17519a(9) =76531a(10) =339617a(11) =1519317a(12) =6868085a(13) =31229275a(14) =143009551a(15) =658263313a(16) =3045358661a(17) =14151988831a(18) =66005473045a(19) =308942367881
External references
- oeis: A149600