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, 0), (1, 0, -1), (1, 0, 1), (1, 1, 0)}.
A150727
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, 0), (1, 0, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =124a(5) =506a(6) =2325a(7) =10121a(8) =47466a(9) =214129a(10) =1017164a(11) =4692031a(12) =22482423a(13) =105282324a(14) =507640379a(15) =2402998152a(16) =11641232260a(17) =55550981755a(18) =270101725432
External references
- oeis: A150727