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, 0, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
A149359
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, 0, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =43a(5) =164a(6) =640a(7) =2610a(8) =10853a(9) =46147a(10) =198963a(11) =869969a(12) =3847766a(13) =17166855a(14) =77287041a(15) =350280733a(16) =1597749772a(17) =7329614871a(18) =33785010841a(19) =156445491596a(20) =727303985933
External references
- oeis: A149359