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), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149923
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), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =159a(6) =567a(7) =2079a(8) =7920a(9) =30827a(10) =122432a(11) =495884a(12) =2034691a(13) =8466701a(14) =35632214a(15) =151397685a(16) =649417899a(17) =2806992134a(18) =12221505766a(19) =53565228368a(20) =236125050931
External references
- oeis: A149923