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, 0), (1, -1, 1), (1, 0, -1)}.
A148472
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, 0), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =69a(6) =259a(7) =995a(8) =3984a(9) =16246a(10) =67846a(11) =288622a(12) =1242949a(13) =5426505a(14) =23918477a(15) =106383490a(16) =477100523a(17) =2153840179a(18) =9786732365a(19) =44713258872a(20) =205300573048a(21) =946979887510
External references
- oeis: A148472