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), (1, 0, 1), (1, 1, -1)}.
A148846
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), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =86a(6) =315a(7) =1050a(8) =3938a(9) =13753a(10) =52320a(11) =188061a(12) =722193a(13) =2646052a(14) =10228879a(15) =37987092a(16) =147565862a(17) =553507453a(18) =2158209505a(19) =8157286661a(20) =31899928604a(21) =121298012320a(22) =475469386593
External references
- oeis: A148846