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, 0), (-1, 1, -1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
A150721
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, 0), (-1, 1, -1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =118a(5) =488a(6) =2136a(7) =9390a(8) =42273a(9) =191865a(10) =881957a(11) =4078484a(12) =19000224a(13) =88957680a(14) =418583423a(15) =1977346075a(16) =9375000007a(17) =44588517768a(18) =212680559222
External references
- oeis: A150721