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, 0, 0), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
A150159
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, 0, 0), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =75a(5) =281a(6) =1124a(7) =4486a(8) =18639a(9) =77206a(10) =328890a(11) =1395906a(12) =6050956a(13) =26136456a(14) =114778979a(15) =502344204a(16) =2228393792a(17) =9853587549a(18) =44063941695a(19) =196458703812a(20) =884350126214
External references
- oeis: A150159