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, 0, 1), (0, 1, 0), (1, 1, -1)}.
A149955
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, 0, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =51a(5) =184a(6) =693a(7) =2692a(8) =10723a(9) =43580a(10) =180097a(11) =754633a(12) =3199231a(13) =13698780a(14) =59163153a(15) =257435987a(16) =1127562315a(17) =4967480864a(18) =21997869745a(19) =97867848691a(20) =437234819487
External references
- oeis: A149955