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, 1), (1, 0, -1)}.
A149063
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, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =40a(5) =157a(6) =640a(7) =2674a(8) =11491a(9) =49979a(10) =221091a(11) =987439a(12) =4452885a(13) =20248676a(14) =92654032a(15) =426656333a(16) =1974387106a(17) =9178717874a(18) =42844941074a(19) =200702312923a(20) =943274839096
External references
- oeis: A149063