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, 1, 1), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
A148398
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, 1, 1), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =53a(6) =201a(7) =751a(8) =2969a(9) =11912a(10) =48722a(11) =202963a(12) =857651a(13) =3662901a(14) =15846173a(15) =69089287a(16) =303942174a(17) =1346846163a(18) =6005971987a(19) =26944569704a(20) =121509650966a(21) =550564330442
External references
- oeis: A148398