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, -1), (-1, 0, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
A149025
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, -1), (-1, 0, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =38a(5) =140a(6) =604a(7) =2449a(8) =10927a(9) =46990a(10) =214160a(11) =949940a(12) =4396411a(13) =19899975a(14) =93160452a(15) =428506551a(16) =2022890300a(17) =9411578929a(18) =44720051414a(19) =209872108538
External references
- oeis: A149025