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, -1, 1), (0, 1, -1), (1, 1, 1)}.
A149709
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, -1, 1), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =71a(5) =281a(6) =1207a(7) =5115a(8) =22351a(9) =97707a(10) =433499a(11) =1929001a(12) =8656613a(13) =38971527a(14) =176423283a(15) =800930495a(16) =3650497845a(17) =16678891433a(18) =76432737821a(19) =350991616137
External references
- oeis: A149709