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, 1, 0), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
A148253
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, 1, 0), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =38a(6) =133a(7) =472a(8) =1765a(9) =6824a(10) =27021a(11) =109776a(12) =454221a(13) =1910817a(14) =8155244a(15) =35228927a(16) =153824125a(17) =678070366a(18) =3013894753a(19) =13496603167a(20) =60844279321a(21) =275940416256
External references
- oeis: A148253