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), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149506
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), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =143a(6) =599a(7) =2025a(8) =8577a(9) =30813a(10) =130227a(11) =487643a(12) =2080201a(13) =7947799a(14) =34171305a(15) =133054913a(16) =573451125a(17) =2267413293a(18) =9813947025a(19) =39208267881a(20) =170253111501a(21) =686862364999
External references
- oeis: A149506