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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
A149984
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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =55a(5) =200a(6) =737a(7) =2800a(8) =10875a(9) =42686a(10) =170295a(11) =683805a(12) =2774827a(13) =11322576a(14) =46519469a(15) =192043347a(16) =796633305a(17) =3317740288a(18) =13867861969a(19) =58155460455a(20) =244585944419
External references
- oeis: A149984