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, 1, 1), (0, -1, 0), (0, 0, -1), (1, 0, 1)}.
A149335
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, 1, 1), (0, -1, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =147a(6) =547a(7) =2103a(8) =8259a(9) =32941a(10) =133800a(11) =548559a(12) =2272771a(13) =9512677a(14) =40082150a(15) =170135424a(16) =726604441a(17) =3119329612a(18) =13462273830a(19) =58348311884a(20) =253930572928
External references
- oeis: A149335